CamStudio is a free and open-source screen recording software that allows users to create video tutorials and demonstrations. It records the user's screen and audio narration into standard AVI video files. The software is easy to use with no programming knowledge required. Users can record their screen activity to create tutorials, demonstrate tasks or programs, or record gaming sessions. The document provides step-by-step instructions on how to download, install, and use CamStudio to record the screen, optimize video settings, and save and share recordings.