Screencast-O-Matic is available in a free version and a pro version. The free version allows you to record for up to fifteen minutes at a time (that is plenty of time for most screencasts), publish to YouTube in HD, and save videos to your computer as MP4, AVI, and FLV files. The pro version ($15/year) includes video editing tools, unlimited recording lengths, a script tool, and removal of the Screencast-O-Matic watermark. Both versions of Screencast-O-Matic include a highlighted circle around your cursor so that viewers can easily follow your movements on the screen. A webcam recording option is included in the free and pro versions of Screencast-O-Matic.
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Screencast-O-Matic won't work on Chromebooks. I recommend using Screencastify or Snagit for Chrome to create a screencast video on a Chromebook.
On a MacBook you can use QuickTime to create a screencast video.
Applications for Education
Screencast videos can be helpful in delivering instruction on how to use a program on a computer or how to use a website. You can also use screencasting tools to create short flipped lessons by capturing yourself talking over a set of slides that you display on your screen.