system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: DotA (the Real Time Strategy game)

I don't get what the difference between this one custom map (gametype?) and Warcraft 3 is.
gpt
One day, you decide to play a game of Pretend War with your friends. You and your friends all bring out a box of toy soldiers and a few toy houses. The rules of this game is that you get to make a base out of your houses, and you get to order your toy soldiers around the battlefield. If a soldier dies, he is removed, but after a little while you can make him again at one of the little houses. You want to destroy everybody else's base with your army. If you lose a house, after a little while you get to put another house in your base.

After a while you get bored of this game, and decide to come up with another game. You already have all your little soldiers and houses and stuff, but you want different rules. So you and your friends bring two adults over, probably two daddies because they're nerdy enough to help out. You tell the daddies: you get to order the toy soldiers, but they're not very smart so just attack the enemy base and whoever is closest to you! And you and your buddies each pull out your own special action figure. You've pulled out Duke Nukem, but Carl pulled out Simba and Alan pulled out GI Joe. Duke Nukem can do awesome things, but Simba and GI Joe can also do awesome things, only they're different awesome things. Everybody is on a team, being with one or the other daddy's team, and you try to destroy the other base, defending your base and killing their heroes if you need to. If your hero gets killed, you have to sit out for a while before you can play again.

Pretend War is Warcraft 3, the other game is DotA.