Okay, so imagine you have 5 crayons and you want to give them to your 5 friends. But you don't want to just give each friend one crayon, you want to make sure they each get a lot of different colors.
That's kind of like what super-seeding is. It's when someone has a file, like a movie or a video game, and they share it with a bunch of people. But instead of just sharing the file one piece at a time, they send different pieces of the file to different people so that everyone gets a good mix of different parts of the file.
This way, everyone who is downloading the file can get it faster because they are getting different parts at the same time from different people.
It's kind of like playing a game of musical chairs but everyone gets to keep a chair until the very end. And everyone gets to sit in the chair they really wanted.