What can I do with Scratch?

As mentioned earlier, Scratch is a block-based language geared for beginners that lets you create your own interactive stories, animations, games, music, and art.

For more on the ins and outs of Scratch check out the guide: 

Scratch 3 Walkthrough and Demo

Connecting to the world

While you do not need a Raspberry Pi to run and use Scratch (there is a web-based editor that can be used on any computer with a browser), the Pi unlocks a whole other set of capabilities for us. 

Connecting this powerful programming language to a Raspberry Pi lets us more easily take advantage of the "GPIO" pins to have our Scratch program interact with the outer world!