Props are objects used by the actors on stage. They can be anything from furniture to weapons to food. Props are usually moved around the stage by the actors during the course of the performance.
Sets are the overall design of the stage, including the scenery, lighting, and sound. Sets are typically created by a team of designers and builders, and they remain in place throughout the performance.
The main difference between props and sets is that props are movable, while sets are not. Props are used by the actors to interact with the environment on stage, while sets provide the overall visual context for the performance.