Screencastify is an extension for Chrome browser that allows you to record the computer screen and voice as a video that can be played back for others. Users can choose from recording a single cab with a new browser or their entire desktop. it does not need any plug-in like Java or Flash so it runs on a Chromebook. the video the videos are saved locally and can be easily uploaded to Google Drive or YouTube to be shared with others.
The free version limits you to a 10 minute recording and there is Screencastify branding at the bottom of the video, but there is a paid version that allows you to create longer videos with no Screencastify branding.
This is a great tool to show students help programs and functions work. It also it is also useful for students to use to show they understand how to use this insert programs.