The Toolbar gives you quick access to the most important functions of the program. You can determine how the toolbar looks like, via the View settings. Choose between small or large icons, text or no text, or no toolbar at all. That gives you a total of 5 options, as shown below.
Toolbar with small icons:
Toolbar with small icons and text on buttons:
Toolbar with large icons:
Toolbar with large icons and text on buttons: