Right click
A right-click is a click that uses the secondary mouse button (often located on the right side) instead of the primary mouse button (often located on the left side).
Windows users
Most Windows computers have mice with two or more buttons so right-clicking should be intuitive and natural.
Macintosh users
Many Macintosh computers have mice with only one button. To right-click on a Mac that only has one mouse buton, hold the ctrl key and click the mouse. However, if your Macintosh has a Mighty Mouse, click the mouse on the right-hand side.
Function
A right-click is oftentimes a shortcut to find out more about the item you clicked on or options that you have within the context of the item that was clicked. Think of the primary (left) mouse button as the action or enter key on the mouse and the secondary (right) mouse button as an information button.