The next part in the series from GameFromScratch.
"In my previous Phaser tutorial on particles I used a sprite sheet to provide particles in one of the examples, then realized I hadn’t covered how to actually use a sprite sheet yet, oops! So this tutorial is going to correct that oversight. A spritesheet ( also known as a texture atlas ), is simply a collection of images together in a single image file. Loading a single file into memory is often more efficient than loading dozens on small images. It’s also generally easier from a resource management perspective."