I will preface my question with the fact that I am a high school student with only a general knowledge of physics, though I have learned about a variety of phenomena at the limited level of depth that I am capable of. I am curious about several concepts and observed phenomena that are fundamentally important to our understanding of the universe, but seem to be nebulously defined. A rather important term among these is 'object'. I have seen this term used to explain other concepts, like matter "Matter is the amount of mass that an object has', mass "Mass is the amount of resistance to acceleration an object has", etc. So to really understand those and other concepts, the idea of the object must be understood. Could I have some assistance in reaching an understanding of this term?