What Is a Webcam and How Does It Work?

On this page (11 sections)

1. What is a webcam used for?
2. How does a webcam capture video?
3. What is a webcam lens and field of view?
4. What resolution should you choose in a webcam?
5. How do focus and lighting affect webcam video?
6. Does a webcam have a microphone?
7. How does a webcam connect to a computer?
8. How do you protect your privacy and care for a webcam?
9. How should you set up a webcam?
10. How do you choose a webcam for your setup?
11. Which webcam should you choose?

A webcam is a camera that sends live video to a computer or another connected device. If you're wondering what is a webcam used for, it gives video apps a camera feed for calls, online classes, interviews, streams, and recordings.

Many external webcams connect over USB and sit on a laptop or monitor. Some also have a microphone, privacy cover, autofocus, or features that adjust the image for changing light.

What is a webcam used for?

A webcam lets you share live video through an app or record video on your device. It can be built into a laptop or attached separately so you can position it where you want.

The camera sends video to software, such as a meeting app. That app can display or record the feed, or send it over the internet to other participants.

For a complete home call setup, see our guide to video conferencing equipment for home offices.

How does a webcam capture video?

A webcam focuses light through a lens onto a digital image sensor. The sensor converts light into image information, and the camera sends that information to the connected device for processing.

The basic steps are:

1. Light from the scene passes through the lens.
2. The image sensor turns light into digital information.
3. The webcam sends image data to the connected device.
4. Software processes the feed and provides it to an app.
5. The app displays, records, or transmits the video.

Video is a sequence of still images shown quickly, along with timing information. Resolution describes the number of pixels in each image; frame rate describes how many images appear each second.

What is a webcam lens and field of view?

The lens focuses light, and the field of view describes how much of the scene the camera includes. A wider view can show more of your room, while a narrower view keeps more attention on you.

Some cameras have a fixed view, while others let you change it in software. The Anker PowerConf C200 offers 65°, 78°, and 95° options, which suit people who want to choose how much of their desk or room appears.

A wide angle can reveal more of your surroundings than you intend. Choose a narrower view if you sit close to a wall or want the background to stay out of frame.

What resolution should you choose in a webcam?

Choose resolution based on how much detail you need and what your room and apps can support. More pixels can show finer detail, but lighting, focus, connection quality, and app settings also shape the image.

The Logitech C920e and Brio 305 capture Full HD 1080p video, while the PowerConf C200 captures 2K video. For routine calls, 1080p is a practical fit; consider 2K if extra image detail matters to you and your setup can make use of it.

Compare the differences in our guide to 1080p versus 4K webcams.

How do focus and lighting affect webcam video?

Focus and light help determine whether your face looks clear on screen. Autofocus adjusts as the scene changes, while a fixed-focus camera works best when you stay at a suitable distance.

The C920e uses autofocus, so it suits a desk setup where you may shift position. The Brio 305 has fixed focus, making it a better fit if you sit in one place during calls.

A webcam also needs enough light for its sensor to capture a clear image. Face a window or lamp when possible, and avoid placing a bright window directly behind you.

The C920e has automatic light correction, while the PowerConf C200 includes low-light correction.

If the picture looks soft or unclear, read why a webcam looks blurry and how to fix it.

Does a webcam have a microphone?

Some webcams include a microphone, but others don't. A built-in mic keeps a simple call setup compact; a headset or separate microphone can give you another way to capture your voice.

The C920e has two integrated omnidirectional microphones. The PowerConf C200 has dual microphones, and the Brio 305 includes a noise reduction microphone.

Microphone pickup depends on the room and how far you sit from the camera. For more help choosing an audio setup, read do webcams have built-in microphones? and how to stop echo on Zoom and Teams calls.

How does a webcam connect to a computer?

Most external webcams connect by USB, then appear as a camera option in compatible apps. Check that the webcam's connector matches a port on your computer before you choose one.

The C920e and PowerConf C200 use USB, while the Brio 305 uses USB-C. Operating system support can also vary: the PowerConf C200 supports Windows 7 or later and macOS 10.11 or later, and the C920e is compatible with Windows 11.

Follow our guide to setting up a webcam on Windows or Mac. After connecting it, select the camera in your call app and check the framing before an important meeting.

How do you protect your privacy and care for a webcam?

Use a physical cover when you want to block the camera's view, and review camera permissions in your device settings. A cover does not mute a separate microphone.

The C920e has an attachable privacy screen, the PowerConf C200 has a sliding cover, and the Brio 305 has a rotating shutter. Choose the type you'll remember to close between calls.

Keep the lens clear with a clean, soft cloth, and avoid touching it with your fingers. Store or position the camera so it won't be knocked off its mount, and unplug it before moving cables or rearranging your desk.

How should you set up a webcam?

Place the webcam near eye level and center it above or beside the screen, so you look toward the camera while speaking. Adjust the frame to include your head and shoulders, then check what appears in the background.

Connect the camera, allow your computer and call app to access it, and select it in the app's camera settings. Check the picture and microphone before a call with our guide to testing your webcam before a call.

Face a light source rather than sitting with a bright window behind you. Keep the lens clean, and make sure the mount feels secure before you start a call.

How do you choose a webcam for your setup?

Choose a webcam by matching its connection, framing, focus, lighting features, microphone, and privacy cover to the way you use it. A feature only helps if it solves a real issue in your room or routine.

• Choose the Logitech C920e if autofocus, a 78° view, two microphones, and an attachable privacy screen suit your desk calls. Skip it if you specifically need USB-C.
• Choose the Anker PowerConf C200 if you want adjustable framing, 2K video, and low-light correction. Skip it if you prefer a camera with a fixed view or don't need its extra resolution.
• Choose the Logitech Brio 305 if your computer has USB-C and you want a rotating privacy shutter. Its fixed focus makes it a weaker fit if you move around a lot while on camera.

Common buying mistakes include choosing a wider view without checking the background, assuming a built-in microphone will suit every room, and overlooking the computer's connector. Also avoid paying for higher resolution if your call app or setup won't benefit from it.

Which webcam should you choose?

Pick the C920e for autofocus and a straightforward desk-call setup, the PowerConf C200 for adjustable framing and 2K video, or the Brio 305 for a USB-C connection and rotating shutter. Match the camera to your computer and room first, then compare resolution and sound needs.

For a closer look at two options, read Anker PowerConf C200 vs Logitech C920: Which Wins?. If your main concern is a laptop's built-in camera, see our guide to the best webcams for laptops with a weak camera.

Frequently asked questions

What does a webcam do?

A webcam captures live video and sends it to a connected device. A video app can use that feed for a call, stream, or recording.

Some webcams also have a microphone.

You can use a separate mic or headset for sound instead.

Does a webcam work without the internet?

A webcam can capture video without an internet connection if a compatible local app or device can access it. You need internet to send video to people online during a video call or livestream.

A webcam itself does not provide an internet connection.

Is a webcam the same as a camera?

A webcam is a camera designed to send live video to a connected device, usually a computer. Many dedicated cameras can also work as webcams with the right connection or software, but may need extra setup.

A built-in laptop camera is a webcam, too.

Do all webcams have microphones?

No. Some webcams have built-in microphones, while others capture video only.

Check the camera's features before relying on it for sound, or use a separate microphone or headset.

Our guide to webcams with built-in microphones explains what to compare.