Okay kiddo, so a praja mandal is a group of people who come together to talk about problems in the world, like how to make their community better. It's like when you and your friends get together to plan a game or activity, but these grown-up people are trying to plan things to make the world a better place for everyone.
In India, a praja mandal was a group of people who met during the time they weren't free because their country was being controlled by someone else. These groups were often made up of people who cared about the rights of Indians and wanted to find ways to help their country become free. They talked about how to make their lives better, how to be treated fairly, and how they could work together to make changes.
So, a praja mandal is like a club for grown-ups who care about making changes in the world to help people live better lives. They come together to talk, plan, and work together to solve problems and help make the world a better place.