The Brushes panel hosts a selection of brush presets which can be selected for use with the Paint Brush Tool and other brush-based tools. Any custom brushes you design can be saved to your own panel categories. ABR Brush files can be imported and will be available in their own separate categories.
A choice of pre-designed brushes are available as selectable thumbnails. With the brush tool selected, the selected thumbnail sets the type of brush to be used. Brushes are arranged in categories.

The panel displays the following:
Edit. Loads the selected brush, allowing it to be customized and optionally saved as a new brush preset.The following options are available from the
Panel Preferences menu: