When people talk about the "need for power," they're usually talking about how some people want more control or influence over other people or things around them. It's kind of like when you and your friends are deciding what game to play, and one of your friends really wants to be the leader and make all the rules.
Sometimes people want power because they believe it will give them more respect or make them feel important. They might also believe they can use their power to help other people or make positive changes in the world. However, sometimes people just want power for their own selfish reasons, and they might use it to hurt or control others.
It's important to remember that having power isn't always a good thing. It can be tempting to try and control everything around you, but it's important to also respect other people's opinions and ideas. Sometimes it's better to work together and share power so everyone can have a say and feel valued.