Photoshop brushes

In photoshop, the brush tool is used to colour in pictures, similar to the brush tool in Microsoft's paint software.
The brush tool include different types of brushes.
When using brushes you can alter the options of brush types, you can increase or decrease the brushes size, you can control the opacity and flow settings which will make the brush lighter.
There are also hardness settings which control the outline of the brush, whether you want and sharp outline or a fading outline.

Above is a self-portrait drawn in Photoshop using brushes, in a space of 40 minutes.