So imagine you have a toy store with a bunch of toys that you own. You're the boss and you make all the decisions about the store. But you don't have enough money to buy all the toys by yourself.
So... you decide to ask your friends for help. You tell them that if they give you some money, you'll let them own a piece of the toy store with you. That's called selling ownership equity.
Let's say you sold 10 pieces of the toy store to your friends. That means they now own 10% of the toy store together. And since you own the other 90%, you're called the majority owner.
Now, if you make more money selling toys, all the owners (including you) get a little richer. And if you lose money, all the owners (including you) lose money too.
Overall, ownership equity means that a bunch of people own a little piece of something important together, and they all share in the good and bad things that happen to it.