Screenshots or screen grabs are a useful tool for demonstrating something that would be to difficult to put into words.
The way to make a screenshot differs depending on whether you have a PC or a Mac computer, Here are the different ways of producing a screenshot.
On a PC computer:
To select what you want to screenshot – go to the start menu and open the Snipping Tool.
On a Mac computer:
To make a screenshot of the entire screen – Command + Shift + 3
To select what you wish to screenshot – Command + Shift + 4
To screenshoot the whole window – Command + Shift + 4+ Space bar