The Ellipse Tool creates elliptical shapes and paths (shape outlines) it’s also used for elliptical, including circular, selections. You can easily select objects such as clocks, balls, and full moons by using this tool. There is a keyboard shortcut where if you see the elliptical tool in the tool box, you can press M on the keyboard, if you see a rectangular tool, press shift + M together on the keyboard. Hope that helped!