I made a sprite atlas, but how do I use it?

The Sprite Editor - Unity Official Tutorials

Sprites (2d and UI) Atlas not reducing number of draw calls

Sprite Atlas Tool | Sprite Management | Unity Asset Store

Pro Atlas Generator - One click atlas generator | Sprite Management | Unity Asset Store

Unexpected behavior while using Sprite Atlas' with Asset Bundles

Unity Sprite Animation Tutorial for Beginners | Kunal Mukherjee posted on the topic | LinkedIn

Sprite Animation in Unity Tutorial

beginner guide to animate a sprite in unity (4.3)