Filters are one of the most valuable features in Revit, but they are often overlooked as an option. Implement a variety of filters including selection, schedule, phase and more to expedite drawing production and maximize quality control.

A Users Guide to Revit Filters
Filters are Freakin' Fantastic!

You'll accomplish the following:

Restrict data shown in construction documents by leveraging schedule filters

Use various view filters to limit content in a view where Revit categories are lacking 

Quickly narrow the selected range of elements with selection filters