Physics can be defined in many different ways. Basically, it is the study of the nature of the entire Universe. However, we have to break the Universe into small, manageable chunks to study and even then, we can't realistically hope to cover everything in our courses. Similarly, we can break the entire field of physics into smaller, more manageable chunks and carefully decide which chunks are needed for students in particular areas of study. Students who want to become engineers don't necessarily need the same body of material needed by students who want to become furniture production managers.
Physics can benefit both, however.
Admittedly, this is not a very satisfying answer and I don't like giving it. More than anything else, studying physics will train you to look at the world around you from a totally different perspective. You will never succeed in any line of work if you can't learn to see things from other points of view. You don't have to agree with the other point of view, you just have to acknowledge that it's there. Among other things, physics will train you to be organized with your thoughts.