Activity theory is a way of thinking about how different activities can help people learn and become better at something. It is based on the idea that we learn best when we are actively doing things, instead of just passively listening or reading something. Activity theory suggests that activities should always be meaningful, with a particular goal or purpose, and that people should be free to choose how they want to do an activity. This way, people learn by doing and become more engaged in the activity, which helps them understand the topic better.