An internet service provider is the company that connects your home to the internet

An internet service provider (ISP) is a business that owns cables, fiber lines, or wireless towers and sells you access to the internet through them. When you pay for internet service, you are paying that company to run a connection into your home and maintain the equipment that keeps you online. The ISP owns the infrastructure — the physical lines or signals — and you pay a monthly fee to use it.

The ISP is not the same as the internet itself. The internet is a global network of connected computers and servers. Your ISP is the local company that gives your home a door into that network. Different ISPs use different technology to deliver the signal: some run copper telephone lines, some use fiber-optic cables, some broadcast from cell towers, and some use satellite. Which technology reaches your address depends on what infrastructure the ISP has built in your area.

Key Takeaways

  • An ISP owns the physical cables or wireless equipment that connects your home to the internet and charges you a monthly fee for that connection.
  • Different ISPs use different technology — cable, fiber, DSL, fixed wireless, or satellite — and not all types are available at every address.
  • Your ISP provides the modem or router (or both) that receives the signal and broadcasts it inside your home, though you may own your own equipment instead.
  • ISPs differ in speed, data limits, customer service, and price, so the best choice depends on what is available where you live and what you actually use the internet for.
  • You sign a contract with your ISP, not with the internet or with other companies that provide email or streaming services.

How an ISP delivers internet to your home

The ISP runs a line from its network hub to your home — either a physical cable buried or strung overhead, or a wireless signal from a nearby tower. That line connects to a device called a modem, which translates the ISP's signal into data your devices can use. The modem sits between the outside line and your home network.

From the modem, the signal goes to a router, which broadcasts the internet wirelessly (WiFi) and through ethernet cables to your devices. Some ISPs provide a combined modem-router unit that does both jobs. Others provide only the modem, and you buy or rent a separate router. The modem is usually the ISP's equipment — you do not own it — but you can buy your own modem in many cases and avoid a monthly rental fee.

The speed and reliability of your connection depend on the technology the ISP uses and how far your home is from their equipment. Fiber-optic cable is fastest and most reliable. Cable (coaxial) is faster than older DSL (telephone line) technology. Fixed wireless and satellite are slower and have higher latency, meaning there is a delay between when you send a command and when it reaches the server.

The different types of ISPs and their technology

Cable ISPs use the same coaxial cables that carry television signals. Comcast, Charter Spectrum, and Cox are cable providers in different regions. Cable is widely available in cities and suburbs and offers speeds of 100 to 500 megabits per second (Mbps) for most customers, though some areas have gigabit service. The downside is that cable bandwidth is shared among all customers in your neighborhood, so speeds can drop during peak hours.

Fiber ISPs use fiber-optic cables, which are thinner and faster than copper. Verizon Fios, AT&T Fiber, and many smaller regional providers offer fiber. Fiber is less common than cable — it is available mainly in cities and newer suburbs — but it offers the fastest speeds, often 300 Mbps to 1 gigabit per second (1,000 Mbps), and does not slow down when neighbors are online. Fiber is also more reliable in bad weather.

DSL ISPs use telephone lines to deliver internet. AT&T, Verizon, and CenturyLink offer DSL in some areas. DSL is available in many rural and suburban places where cable and fiber are not, but it is slower — typically 5 to 25 Mbps — and speed drops the farther you live from the ISP's hub. Many DSL providers are phasing out service as fiber expands.

Fixed wireless ISPs broadcast internet from a tower to an antenna on your roof or window. T-Mobile Home Internet and Verizon 5G Home are newer options. Fixed wireless is available in areas where the company has built towers and is faster than satellite, but it can be affected by weather and obstacles between your home and the tower.

Satellite ISPs like Starlink and Viasat send signals to and from satellites in orbit. Satellite reaches remote areas where no other option exists, but it has high latency (delay), lower speeds, and data caps. It is a last resort for people with no other choice.

What you pay for and what affects the price

You pay your ISP a monthly fee for internet access. The price depends on the speed tier you choose, the technology available in your area, and the company. A basic cable plan might cost $40 to $60 per month for 100 to 200 Mbps. A faster plan costs more. Fiber is often pricier upfront but offers better value at high speeds. Satellite and fixed wireless are usually more expensive than cable or fiber for the same speed.

Many ISPs bundle internet with cable television or phone service and offer a discount if you take multiple services. The bundle price is usually lower than paying for each service separately, but you may end up paying for channels or services you do not use. Some ISPs also charge an installation fee, a modem rental fee (if you do not own your own), or an early termination fee if you cancel before your contract ends.

Data caps are limits on how much data you can use per month before the ISP slows you down or charges extra. Cable and fiber ISPs sometimes have data caps of 500 gigabytes to 1 terabyte per month, though many have removed caps in competitive areas. Satellite almost always has a data cap. DSL and fixed wireless vary by provider. If you stream video, read large files, or have many devices online, a data cap can be a real cost.

What an ISP does and does not provide

Your ISP provides the connection to the internet and the equipment to receive it. They do not provide email, cloud storage, streaming services, or social media — those are separate companies and services. You can use any email provider, any streaming service, and any website you want through your ISP's connection. The ISP is just the pipe.

The ISP is responsible for maintaining the line to your home and the modem. If your internet stops working, you call your ISP. If a website is slow or down, that is not the ISP's problem — it is the website's server or your own WiFi. If you cannot connect to WiFi, it might be your router, not your ISP connection. Knowing the difference saves you time on support calls.

Some ISPs offer technical support for WiFi problems or device connections, but this varies. Most will help you troubleshoot the modem and the line to your home. They will not help you set up a printer or fix your laptop — that is on you or a tech support service you hire separately.

How to find out which ISPs serve your address

Not every ISP serves every address. Your location determines what is available. To find out which ISPs reach your home, use the FCC's broadband map at broadbandmap.fcc.gov, enter your address, and see what providers and speeds are listed. You can also call or visit the websites of ISPs you know operate in your area and enter your address to check availability.

The FCC map is the most reliable source because it is based on data ISPs report to the government. However, the data is not always current, and availability can change. If the map shows an ISP serves your area but their website says it does not, call the ISP directly to confirm. Some providers have patchy coverage within a town, and your specific address might not be in their service zone even if nearby addresses are.

Frequently Asked Questions

Is my ISP the same as my email provider?

No. Your ISP is the company that connects you to the internet. Your email provider is a separate service — Gmail, Outlook, Yahoo, or another company — that you access through that connection. You can change email providers without changing your ISP, and you can change ISPs without losing your email.

Can I use any modem with any ISP?

Not always. ISPs use different technologies and standards, and some modems only work with certain providers. Before you buy a modem, check your ISP's list of approved modems on their website. Some ISPs require you to use their equipment, though this is becoming less common. If you own your own modem, you usually save the monthly rental fee.

What should I do if my internet stops working?

First, restart your modem and router by unplugging them for 30 seconds and plugging them back in. If that does not work, check the lights on the modem — they tell you whether the line to your home is working. If the lights show no connection to the ISP, call your ISP's support line. If the lights show the connection is fine but you have no WiFi, the problem is your router, not your ISP.

Do I have to sign a contract with my ISP?

Most ISPs offer month-to-month service without a contract, though some still require a one- or two-year contract in exchange for a lower price. Read the terms before you sign. If you sign a contract and cancel early, you may owe an early termination fee. Month-to-month service costs more per month but gives you the freedom to switch if you are unhappy.

Why is my internet slower than the speed I pay for?

The speed you pay for is the maximum speed available on your plan, not a may provide. Your actual speed depends on how far you are from the ISP's equipment, how many neighbors are using the network at the same time, WiFi interference in your home, and the devices you are using. Run a speed test at speedtest.net to see what you are actually getting, then contact your ISP if it is much lower than advertised.