Power politics is like when you and your friend are fighting over who gets to choose which game to play. You both want to be the one who decides and don't want to give up that power. Sometimes countries and leaders act the same way. They want to be in charge and have power over other countries or people. They might do things like make threats, use force, or make alliances with other countries to get what they want. Just like in your game with your friend, countries use power politics to try and get their way and be in charge. The book "Power Politics" by Kenneth Waltz talks about how this works on a bigger scale and how it affects our world.