Video capturing is the process of recording of what ever is being played on screen of you PC.
Why do you need video capturing?.
Good question actually, you might need video capturing software for the following purpose.
Creating a tutorial: You might want to tell someone how to do a particular process and explaining it in writing is very difficult. In those cases video capturing is just the thing that you will need..
What does it do?.
Video capturing allows you to save the captured things as video (avi or flash files) which you can share with others..
How to do video capturing?.
There are number of software's available that you can use to do that. Some of them are paid and others are free..
You can download that software from here..