To Front/ To Back

So ive seen this option when right clicking things and i have no clue what it is. Ive had a hard time finding any info on it, but could totally be looking in the wrong spots. I think i saw someone using it when doing something with map layers but not positive. Any help would be great! Mostly new to roll20 so still learning the ropes. Happy hunting!

so imagine a stack of papers, some of them are different sizes and shapes, but they are stacked up. To front, moves the item to the top of the stack, covering the items underneath (behind) it. To back, moves it to the bottom of the stack. Now one thing to keep in mind is that the Map layer is a different, self contained stack than the Object & Token layer. Map layer is always under the Object & Token layer. That help?

This helps a lot. Its sorta what i thought but describing it as stacks of paper was great. Now time to play around with it. What do you use the function for? Is it mainly for revealing areas or something? Thanks btw!

Wow, long time between beers.... You might have a false wall in a room, so you'd have the wall graphic separate to the main map so you can delete it when it slides open. You might have a big rug on the floor, but it gets in the way on the token layer so you need to move it to the map layer. If you didn't have "to front"/"to back" functionality, they'd sit behind the map graphic and you wouldn't be able to see them or do anything with them. Same concept with the token layer, though its generally not a great place to have too much stacking going on, it makes selecting the right token more difficult. One thing to note is that a token with player permissions will always sit in front of a token without any player permissions on the token layer. This means you can't place an image on top of a player token to obscure them.