Usage aspect:

The 4k pc camera is manly used for video calls,live streaming,meeting and so on on the computer.

The digital camera is mainly used for take photos and record videos.Ans it can also use alone.

Performance features

Image quality:

web cam 4k picture quality is general, common 720P, 1080P resolution, low light environment may have more noise.

The digital camera has high picture quality,with the 4K and higher resolutions, which can capture more details and colour.

Mode of focus:

Web cam 4ks are mostly autofocus, which is fast but may not be as accurate as digital cameras.

The digital camera has  automatic, manual and continuous focus mode, manual focus can meet the needs of professional creation.

Optical zoom:

The computer cameras generally do not have optical zoom, digital zoom will lose picture quality;

Part of the digital camera has optical zoom for lossless magnification of distant objects.

Portability:

The Computer Camera is small,which connect the computer.

The range of its usage is limited.The digital camera has multi sizes.It is portable and can be carried around.

Operational method:

The computer camera is easy to install though computer software control.

Digital camera operation is relatively complex, there are special buttons and menus to adjust parameters, need to master photography knowledge and skills.