The Custom Physics Shape editor provides various functions to allow you to create or generate the physics shape of the SpriteA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info
See in Glossary. There are two ways to create a custom physics shape: have Unity automatically generate the shape, or manually create and edit it in the editor window.