Confused... Listener question

I hear you talk about the absolute, the relative and the illusory. Can you remind me what these terms mean? I have it in my head that the absolute is the infinite/mind. The illusory is our constantly changing experience of form via the medium of thought. But then there this in-betweeny thing of the relative that is neither and the body, I’ve heard you say, sits in that category, and the body you talk of as ‘real’. I’m not sure why the body doesn’t also fall under the category of the illusory and gets its own category as it is also form. Confused…--