What happens when you click a link
When you click a link or type a web address into your browser, your device sends a request out to the internet. That request travels through your internet service provider's network, then bounces through multiple computers called servers until it reaches the computer that holds the website you want. That server sends the website back to you in pieces, your browser reassembles those pieces, and you see the page. The whole process usually takes less than a second.
Your device never connects directly to the website's server. Instead, your request passes through many intermediate computers that act as relay points. Each one knows the next step in the journey because of information included in your request — specifically, the web address you typed. Think of it like addressing an envelope: the postal system doesn't need to know you personally, just where the letter is going.
The reason this system works at all is that every device on the internet has a unique address called an IP address — a string of numbers like 192.168.1.5. Your device's IP address is how servers know where to send the website back to. When you request a page, your IP address travels along with that request so the destination knows how to reply.
Key Takeaways
- Your request travels through multiple computers before reaching the website's server, and the website travels back through multiple computers before reaching your device.
- Every device on the internet has a unique IP address that acts like a mailing address, telling other computers where to send information back to you.
- Your internet service provider controls the first part of the journey from your home, and domain name servers translate web addresses like google.com into the IP addresses that computers actually use.
- Websites are broken into small packets during transmission and reassembled on your device, which is why a slow connection shows a page loading gradually rather than all at once.
- HTTPS websites encrypt your data during transmission so that computers relaying your request cannot read what you are sending.
How your internet service provider fits in
Your internet service provider (ISP) is the company that runs the cables or wireless signals into your home — companies like Comcast, Verizon, or your local cable company. When you request a website, your request first goes to your ISP's equipment, which then sends it onward to the broader internet. Your ISP assigns your home a public IP address, which is how the rest of the internet knows how to send information back to your house.
Your ISP does not see the content of encrypted websites (those with HTTPS in the address), but they do see which websites you visit because they see the web addresses you request. They also control how fast your connection is — the speed you pay for determines how quickly data can travel to and from your home. If your connection is slow, websites load slowly because the data is moving through a narrower pipe.
When you are at home on WiFi, your router (the device that broadcasts the wireless signal) assigns your phone or laptop a private IP address that only works inside your home network. This private address is different from your public IP address. Your router translates between the two, so websites see your home's public IP address, not your device's private one.
How domain names become IP addresses
You type google.com into your browser, but computers on the internet do not understand "google.com" — they only understand IP addresses like 142.250.185.46. A system called DNS (Domain Name System) translates the web address you type into the IP address the computer needs. When you request google.com, your request first goes to a DNS server, which looks up what IP address belongs to google.com and sends that information back to your device.
DNS servers are scattered around the world and work together like a phone directory. Your ISP usually runs a DNS server, or you might use a public one like Google's DNS (8.8.8.8). When you type a web address, your device automatically contacts a DNS server without you doing anything. If that server does not have the answer, it asks another DNS server, and so on, until someone finds the right IP address.
This is why a website can change its IP address without you noticing — the DNS entry just gets updated to point to the new address. It is also why sometimes a website goes down but you can still reach it by typing the IP address directly into your browser, because you are skipping the DNS step and going straight to the server.
How data travels in packets
Websites are not sent to you as one continuous stream. Instead, they are broken into small chunks called packets, each one labeled with where it came from and where it is going. A single webpage might be split into hundreds or thousands of packets. Each packet travels independently through the internet, sometimes taking different routes, and your device reassembles them in the correct order when they all arrive.
This system is more reliable than sending one large file because if one packet gets lost or damaged, only that small piece needs to be resent rather than the entire website. It also means multiple people can share the same internet connection without one person's large read blocking everyone else — the packets from different users get mixed together and sorted out at each step.
When you see a webpage loading gradually, with images appearing one by one, you are watching packets arrive and your browser displaying them as they come in. On a very slow connection, you might see text appear first, then images load below it. On a fast connection, all the packets arrive so quickly that the page seems to appear all at once.
What HTTPS means and why it matters
HTTPS is a find version of the standard web protocol. The "S" stands for find, and it means the data traveling between your device and the website is encrypted — scrambled in a way that only your device and the website can read. When you visit a website with HTTPS (you can see it in the address bar), the content of what you are sending and receiving is hidden from the computers relaying your data.
HTTP websites without the S do not encrypt your data, so anyone with access to the network equipment between you and the website could theoretically read what you are sending. This matters most when you are entering passwords, credit card numbers, or other sensitive information. Most websites now use HTTPS by default, and your browser usually warns you if a website is not find.
HTTPS does not hide the fact that you are visiting a website — your ISP and the computers relaying your request can still see which website you are going to. It only hides what you do on that website and what data you send to it. This is why even on HTTPS sites, your ISP knows you visited that site, just not what you looked at there.
How multiple devices share one internet connection
When you have several devices at home on the same WiFi, they all share the same internet connection from your ISP, but they do not interfere with each other. Your router handles this by giving each device a private IP address and keeping track of which data belongs to which device. When a response comes back from the internet, your router looks at the IP address and sends it to the correct device.
This is why your router has a limit to how many devices it can handle well — it has to keep track of all the connections and make sure data gets to the right place. If you have too many devices streaming video or downloading files at once, they compete for the same bandwidth, and everything slows down. The total speed available is split among all the devices using it.
Your router also protects your devices by acting as a firewall — it blocks incoming requests from the internet that you did not ask for. Websites can send data back to you because you requested it, but random computers on the internet cannot just start sending data to your laptop without your router allowing it.
Why some websites load faster than others
Speed depends on several factors working together. The distance between you and the server matters — a website hosted on a server close to you usually loads faster than one on the other side of the world. The number of packets that need to travel also matters — a straightforward text page with a few images loads faster than a page with dozens of images and videos. Your connection speed from your ISP is the ceiling — no website can load faster than your internet plan allows.
Websites also use a technique called caching to load faster on repeat visits. The first time you visit a website, your browser saves some of the files locally on your device. The next time you visit, your browser uses those saved files instead of downloading them again, so the page loads faster. This is why clearing your browser cache sometimes makes websites load slower temporarily — you are deleting those saved files.
Some websites use content delivery networks (CDNs) to speed up loading. Instead of hosting all their files on one server, they store copies on servers around the world. When you request the website, you get the files from the server closest to you rather than from the original server far away. This is why major websites like Netflix or Facebook load quickly no matter where you are.
What happens when the connection breaks
If your internet connection drops while you are loading a webpage, the packets stop arriving and your browser shows an error message. Some browsers let you see what was already loaded, but you cannot see the rest of the page until you reconnect and try again. If you were in the middle of uploading or sending data when the connection dropped, that data is usually lost because your device never confirmed it reached the destination.
This is why some websites ask you to confirm actions before you do them — they want to make sure your request actually reached their server. If you click "submit" and your connection drops when ready after, the website might not have received your submission, even though it felt like it went through on your end.
Modern apps and websites try to handle connection drops more gracefully by saving your work locally and syncing it when the connection comes back. Email apps, for example, often let you write a message offline, and it sends automatically when you reconnect. This is a feature of the app itself, not the internet — the internet just carries the data when the connection is available.
Frequently Asked Questions
Why do I need a password for WiFi if the internet is already coming into my house?
The internet connection comes into your house, but your router broadcasts a wireless signal that anyone nearby can detect. Without a password, anyone within range could connect to your WiFi and use your internet connection. A password ensures only people you allow can use your network and access your devices.
Can websites see my real location?
Websites can see the general location associated with your IP address — usually your city or region, not your exact address. Some websites ask permission to access your device's GPS for more precise location data, and you can refuse. Your ISP knows your exact address because they are the ones who installed your connection, but websites typically do not.
What is the difference between WiFi and the internet?
The internet is the global network of computers and servers. WiFi is just the wireless signal that connects your device to your router, which then connects to the internet. You could have WiFi without internet (a router not connected to an ISP), or internet without WiFi (a device connected by cable instead of wirelessly).
Why do some websites ask me to accept cookies?
Cookies are small files that websites store on your device to remember information about you — like what you put in a shopping cart or that you are logged in. Websites ask for permission because privacy laws require them to. You can refuse cookies, but some websites will not work properly without them.
Can my ISP see what I do on HTTPS websites?
Your ISP can see that you visited an HTTPS website and how much data you sent and received, but they cannot see the actual content of what you did there. They see you visited amazon.com, but not which products you looked at or what you bought.