For questions about increasing, decreasing or finding out more information about the levels of magnification within a software application.

To zoom is to change the level of magnification you are viewing an object at.

'Zooming In' refers to increasing the magnification level whilst 'Zooming Out' refers to decreasing the level of magnification.

In general, the main purposes of this action are to gain either a more detailed or a less detailed view of the object you are focusing on.