How Do Webcams Work
A basic webcam consists of a digital camera connected to your computer through a USB port. Software then connects to the camera and takes a frame from it every few seconds or minutes - you set the time.
The software will take a still image from the camera once every 10 or 20 seconds. The software then converts the image into a JPG file and FTP's it to your Web server. This JPG image can now be placed on a Web page.
If you dont have a Web server, some companies now offer free places to upload your images, saving you the trouble and cost of a buying and configuring a Web server or a hosted Web site.