Region
Regions appear as rounded rectangles in the Tracks area. They represent the recordings and added media files in a project, and act as a container for audio or MIDI events.
There are five types of regions: audio regions, MIDI regions, Drummer regions, pattern regions, and folder regions (usually referred to as folders). By default, each region type uses a different color: For example, audio regions are blue, MIDI regions green, and Drummer regions yellow.