A webcam (web camera) takes images and videos and sends them in real-time to another computer over the internet or a local network. It usually connects to the computer through the USB or PS/2 port, or over a wireless connection such as Bluetooth or Wi-Fi. Most models can also take still images and videos when offline.
A Wired webcam connects to a peripheral port using a cable. Some models have plug and play (PnP) installation, which allows it to operate without installing driver software. It often has a clip at the base that secures it to a table or a stand for stability. It has a relatively low frame rate, but it can still produce satisfactory images.
A Wireless webcam connects to a computer using Bluetooth or a Wireless network (Wi-Fi). It provides greater flexibility and freedom of movement, allowing various angles and positions relative to the computer. It is more expensive than a Wired webcam. It may also come with a clip for stability.
These are basically digital cameras with a webcam feature. It usually connects to a computer's USB port, but requires a webcam application to access the webcam function. It can broadcast live video and has a higher frame rate.