A resistance movement is when a group of people work together to oppose a government or organization they disagree with. Imagine you and your friends playing a game of tag, but one player is always it and not playing fair. You and your friends might agree to resist and not play with that player anymore.
Similarly, resistance movements often form because people are unhappy with how they're being treated by those in power. Maybe they're not being allowed to do things they want to do, or they're being punished unfairly. In response, they might come together and find ways to push back against the people who are causing those problems.
Resisters often use non-violent tactics to make their point, such as protesting or boycotting. Think of it like when you don't want to eat your vegetables, so you refuse to go to dinner until your parents let you have something else. It's a way of using your voice and choices to make a statement.
However, some resistance movements may use more forceful means, such as sabotage or guerrilla warfare (which means fighting in small groups instead of a big army). This is not generally seen as a good thing, and can lead to a lot of damage and harm.
Ultimately, the goal of resistance movements is to bring about change, either by convincing those in power to listen to their concerns, or by forcing them to through more aggressive means. The important thing is to remember that while resistance can be necessary, it should always be done with the safety and well-being of all involved in mind.