Definition of digital camera :
A still camera that records images in digital form. Unlike traditional film cameras that record a light image on film (analog), digital cameras record discrete numbers for storage on a flash memory card or optical disc. As with all digital devices, there is a fixed, maximum resolution and number of colors that can be represented. Images are transferred to the computer with a USB cable, a memory card or wireless. Digital video cameras (see camcorder) also use FireWire.
Digital Advantages
There are three distinct advantages of digital cameras over their analog counterparts. First, you can review the finished image immediately and erase the others. Second, you can take and print one picture without waiting to develop an entire roll of film. Finally, memory cards, the storage mechanism most widely used for "digital film," are reusable over and over.
(WEB CAMera) A front-facing video camera that attaches to a computer typically via USB or that is built into a laptop or desktop screen. It is widely used for Skype and other video calling software as well as to continuously monitor an activity and send it to a Web server for public or private viewing. Webcams purchased as separate peripherals generally have a microphone built into the unit, or an external mike comes in the package.
Webcams Vs. Network Cameras
A Webcam attaches to, or is built into, the computer, whereas a "network camera" is a stand-alone unit that connects to an Ethernet network. While the Webcam is commonly used for videophoning with another user, network cameras are used to monitor locations such as stores and offices.
