Revising, proofreading, and editing are different stages of the writing process.
Revising is making structural and logical changes to your text—reformulating arguments and reordering information.
Editing refers to making more local changes to things like sentence structure and phrasing to make sure your meaning is conveyed clearly and concisely.
Proofreading involves looking at the text closely, line by line, to spot any typos and issues with consistency and correct them.