The Filter Builder is a visual tool for creating, maintaining and testing Boolean expressions.  The Filter Builder's visual embodiment of a Boolean expression is the "composite filter", which is an aggregation of one or more "filter elements".  Each filter element encapsulates a simple Boolean test to be performed on some value.  The aggregations are realised by "filter groups", each of which represents a Boolean operator such as "AND" and "OR" and can contain any number of elements and groups.

 

The Filter Builder is often used in conjunction with the Filter Tray and the Composite Filter Cache.  It is shown by selecting View → Filter Builder from the menu bar.