A screencast (also known as video screen capture) is a digital recording of computer screen output that usually contains audio narrations. So basically, an application that records a user's screen activities and then saved them in video format is called screencasting software. The program is often used for training, demoing, documentation, and for assessing technical skills.If you are using Linux and are looking for a screencasting tool that would suit you needs, then you are in luck because there are plenty to choose from.