With DroidCam, users can use their cell phones as webcam input sources on their PC (via a separate version for Android available from Google Play Store).
It’s a good concept that’s pretty simple. All you need to do is run the Android client from your Android phone and get the program running on your PC. You can connect DroidCam via WiFi, Ethernet, or USB.
Following all of the steps is recommended. After you have completed this step, your Android-powered device can be used with Skype, AIM, YIM, or pretty much any other instant messaging application as a webcam. Thus, DroidCam can replace the need for a separate Webcam for your PC.