Creative Media Services Consultant helping businesses, non-profits, and individuals overcome the hurdles of cameras, microphones, lights, TVs, projectors, PowerPoint, and more.
Modern Operating Systems have built-in support for screen recording.
Windows: http://winsupersite.com/windows-10/how-use-windows-10s-screen-recording-utility
Mac: https://support.apple.com/en-us/HT201066
There are also more powerful standalone applications like Camtasia that are popular, but all allow you to record your screen and an audio source like your computer's microphone.
Hope this helps.
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