The Internet of Things is everyday objects that talk to each other and the internet without you pushing buttons
The Internet of Things — usually called IoT — means physical devices that collect information and send it somewhere else, usually over the internet. A smart thermostat that learns your schedule and adjusts the temperature on its own. A doorbell camera that sends you video when someone rings it. A fitness tracker that counts your steps and uploads them to an app. A refrigerator that tells you when milk is running low. These are all IoT devices because they have sensors, they connect to the internet, and they do something based on what they sense.
The key difference from older technology is that these devices work without you telling them to. You do not open an app and press a button to make your smart thermostat check the temperature — it does that automatically, all day and night, and makes decisions on its own. That automatic sensing and decision-making is what makes something "smart" instead of just electronic.
Key Takeaways
- IoT devices have sensors that collect data, connect to the internet, and take action without you manually controlling them each time.
- Common IoT devices in homes include smart speakers, security cameras, thermostats, doorbells, and fitness trackers.
- Every IoT device that connects to your home network creates a potential entry point for someone to access your data or your other devices.
- You can reduce risk by changing default passwords, keeping devices updated, and understanding what data each device collects and where it goes.
How IoT devices actually work in your home
An IoT device has three basic parts: a sensor that measures something (temperature, motion, sound, location), a processor that decides what to do with that information, and a connection to send data somewhere. That "somewhere" might be a company's server, an app on your phone, another device in your home, or all three.
A smart doorbell camera, for example, has a motion sensor, a camera, and a wireless connection. When it detects motion, it records video, compresses it, and sends it to the doorbell company's servers. You get a notification on your phone, and you can watch the video or talk through the speaker. The device does all of this without asking permission each time — it is programmed to do it automatically.
A smart thermostat works similarly. It has temperature and humidity sensors, learns your schedule by watching when you adjust it, and then makes changes on its own. Some models also have motion sensors that detect whether anyone is home. All of this data — your temperature preferences, your schedule, whether you are home — gets sent to the thermostat company's servers so the device can learn and improve.
What data IoT devices collect and where it goes
Every IoT device collects something, and most send that data somewhere. A fitness tracker collects your steps, heart rate, and sleep patterns. A smart speaker collects your voice commands and, in some cases, records audio even when you have not said the wake word. A security camera collects video and audio of your home. A smart plug collects information about when you use electricity and how much.
That data goes to the company that made the device. Amazon stores Alexa voice data on Amazon's servers. Google stores Nest thermostat data on Google's servers. Wyze stores camera footage on Wyze's servers. Some companies keep the data for a set time and then delete it. Others keep it indefinitely. Some sell anonymized data to advertisers or researchers. Some share it with law enforcement if they receive a warrant. You usually find these details in the privacy policy, but most people do not read it.
The risk is not just that a company has your data — it is that the company's servers could be hacked, or that the company could change its privacy policy, or that the data could be subpoenaed by a court. A smart home security system that records video of your home is useful, but it also means a company has video of your home, and that video could potentially be accessed by someone else if the company's security is weak.
Security risks that come with connected devices
Every device that connects to your home network is a potential weak point. If someone hacks your smart thermostat, they might not be able to steal your banking passwords — but they could get into your home network and then try to reach your computer, your phone, or your router. A hacked IoT device is often the first step in a larger attack.
Many IoT devices ship with weak default passwords — sometimes the same password on thousands of identical devices. If you do not change the password, someone who knows the default can access your device. Some devices never get security updates, so if a vulnerability is discovered, it stays vulnerable forever. Some devices have poor encryption, meaning data travels across the internet in a form that is straightforward to intercept.
A third risk is that the company making the device goes out of business or stops supporting it. If your smart lock stops receiving updates, it becomes more vulnerable over time. If the company's servers shut down, your device might stop working entirely, or it might stop working the way you expect.
Steps to reduce risk if you use IoT devices
If you decide IoT devices are worth the trade-off for you, there are concrete steps that reduce risk. Change the default password on every device to something long and unique — at least 16 characters, with uppercase, lowercase, numbers, and symbols. Use a different password for each device so that if one is hacked, the others are still safe.
Keep devices updated. Most IoT devices can be set to update automatically. Turn that on. Check the manufacturer's website occasionally to see if there are security updates available. Some devices require you to manually read and install updates, which is annoying but worth doing.
Put IoT devices on a separate network if your router supports it. Many modern routers let you create a guest network. Put your smart home devices on that network instead of the main one where your computer and phone live. If someone hacks a smart bulb, they cannot reach your laptop.
Understand what data each device collects and where it goes. Read the privacy policy, or at least the summary. Disable features you do not need — if your smart speaker does not need to record audio, turn off audio recording. If your fitness tracker does not need to share data with advertisers, opt out. You cannot eliminate the risk, but you can reduce it to match your own comfort level.
The difference between IoT and regular smart devices
The term "smart" gets used loosely. A smart TV is an IoT device because it connects to the internet and collects data about what you watch. A smart speaker is an IoT device. A smart refrigerator is an IoT device. But a device that just has a wireless remote — like some older wireless headphones — is not really IoT because it does not collect data or make decisions on its own.
The distinction matters because IoT devices are always collecting and sending data, while a straightforward wireless device just receives commands. An IoT device is more powerful and more convenient, but it also means more data is being generated about you and more opportunities for something to go wrong.
When IoT devices make sense and when they do not
IoT devices are useful when they save you time or money or give you information you actually need. A smart thermostat can reduce your heating and cooling costs by learning your schedule. A security camera can let you check on your home when you are away. A smart plug can help you see which appliances use the most electricity.
They are less useful when they are just convenient for convenience's sake. A smart refrigerator that tells you when milk is low is nice, but you can also just look inside. A smart toothbrush that tracks your brushing is clever, but you do not need it to brush your teeth well. The question to ask is: does this device solve a real problem for me, or am I buying it because it is new?
The second question is: am I comfortable with the data trade-off? If you use a fitness tracker, you are telling the company your heart rate, your location, and your sleep patterns. If you use a smart speaker, you are sending your voice to the company's servers. If you use a security camera, you are storing video of your home on someone else's computer. Those might be worth it to you. They might not be. That is a choice only you can make.
Frequently Asked Questions
Do I need to worry about my smart home devices spying on me?
The risk is real but manageable. Smart speakers and cameras do collect audio and video, and that data goes to the company's servers. But most companies have security measures in place, and most do not intentionally spy on users. The bigger risk is that a hacker could access the device, or that the company could be hacked. Change your passwords, keep devices updated, and disable features you do not use.
What happens if I do not update my IoT devices?
Unpatched devices become more vulnerable over time. If a security flaw is discovered, hackers can exploit it. Your device could be used to attack other devices on your network, or someone could access the data it collects. Updates usually take just a few minutes and can be set to happen automatically.
Can someone hack my home network through a smart bulb?
Yes, if the smart bulb is on the same network as your computer and phone. That is why putting IoT devices on a separate network is a good idea. If your router does not support a guest network, at least make sure your main devices have strong passwords and are kept updated.
Is it safe to use a smart lock on my front door?
Smart locks are generally safe if you choose one from a reputable manufacturer, change the default password, and keep it updated. The lock still has a physical keypad or key backup, so you are not locked out if the internet goes down. The main risk is the same as any IoT device: the company's servers could be hacked, or the device could be exploited as an entry point to your home network.
What should I do with old IoT devices I no longer use?
Reset the device to factory settings before you throw it away or give it away. This erases your data and removes your account from the device. Some devices have a reset button; others require you to hold it down for several seconds. Check the manufacturer's website for instructions specific to your device.