This is my view on the two.. Editing is when you are fixing the grammar and mechanical errors. Revising is when you improve your writing or update it. Its when you go through your piece and replace redundant words. And when you change up details, and you add more vivid imagery in it. Simple, editing is correcting your paper (Proof reading) and Revising is when you upgrade your piece. Correct me if Im wrong.. Just thought I'd give my thought.