To show someone what you do with the computer you can choose to make static screenshots, but it is much better that the screenshots are dynamic like those obtained with ACA Screen Recorder, since in this way you can see all the actions taken.
This program records in video any activity that happens in the monitor of your PC, including the cursor and each one of the elements appeared in the screen. In addition, ACA Screen Recorder is one of the few programs that also stores the sounds that are played.
Through the configuration menu it is possible to adjust various parameters: quality, format, and so on. On the other hand, it allows to choose the exact area to treat the monitor.