Imperial feminism is a very fancy way of saying that some women who live in powerful countries like to think they are helping other women in less powerful countries, but they might actually be doing more harm than good.
Imagine you have a toy and your friend doesn't have any toys. You might think it's nice to give your friend your toy so they can play with it. But what if your friend actually wants to play a different game, or she just wants to feel like she can earn her own toy? By giving her your toy, you could actually be taking away her opportunity to grow and learn.
Imperial feminists are like someone who gives away their toy without thinking about what the other person really wants or needs. They might go to a less powerful country and say "we're going to teach you how to be more like us. We're going to teach you to dress the way we do, and to work in the same jobs we do, and to think the same way we do when it comes to things like politics and religion." But the people in the other country might not want to do things that way, or they might already be working on their own solutions.
This can cause problems because the imperial feminists might push their way of doing things onto other people instead of listening to them and working together. They might also ignore the fact that their own country might be part of the problem that makes life difficult for women in other places.
So what's the solution? Well, like sharing toys, it's really important to listen to the other person and to work together. We can learn a lot from each other and build each other up instead of assuming one way is better than the other. That way, we can all be happy and get what we need to play the best game possible.