Explain Return Like I'm Five

So, we can think of a function as a box that does things, right? We put things into the box and the box acts upon them.

For example, imagine a box called "plus". The plus box will add together whatever things we happen to put into it. Like this:

 ┏━━━━━━━━━━┓ 1 ────> │ ───┐ ┃ ┃ 1 + 2 ┃ 2 ────> │ ─────────┘ ┃ ┗━━━━━━━━━━┛ 

Right now, we've used "plus" to add 1 and 2. We have 3, but it's just sitting in our box. We want 3 to be able to get out of the box:

 ┏━━━━━━━━━━┓ 1 ────> │ ───┐ ┃ ┃ 1 + 2 ────> 3 2 ────> │ ─────────┘ ┃ ┗━━━━━━━━━━┛ 

The return keyword is what allows us to get the 3 out of the box. Now, we give our box 1 and 2, and get 3 in return.