Depth of field

In photography, the Depth of Field – or depth of field – represents the area in which the objects of an image appear sharp and focused. In video games it can be translated, in a few words, as “the effect that blurs objects in the background”. The effectiveness of this option and its “heaviness” on the system depends on how it was implemented in the video game. For this reason you should experiment according to your personal tastes and the game you are playing with.

Source: TomsHW