What are the main components of a web camera

How about you google that? Are you looking to make one? If you need components, or just someone to make the webcams, visit

http://www.alibaba.com/

I spent a long time poking around looking for the info - result were more for the drivers or parts of a system that a webcam was in. I'm not looking to make one, just need to understand the market and who the key players are.