This guest post cannot possibly say everything about revision and does not need to. Nikki Graham has already grouped together a number of revision-related blogs worth reading here for your convenience.
This means I am free to skip all the usual definitions and give you instead a hotch-potch of impressions and experiences which might give you some food for thought about how you approach revising your own work, how to refine your response to revisions by others of your work, and how you, perhaps, perform revisions on the work of others. I have written from the perspective of a revisor; a revisor whose own translation and revision work has come under harsh scrutiny where some revisions made and conclusions drawn have been justified, and others not. I continue to hope that insights thus gained serve to make me a better translator and a better revisor.