If you have been incorporating each set of revisions as Mariah has, you have produced multiple drafts of your writing. So far, all your changes have been content changes. Perhaps with the help of peer feedback, you have made sure that you sufficiently supported your ideas. You have checked for problems with unity and coherence. You have examined your essay for word choice, revising to cut unnecessary words and to replace weak wording with specific and appropriate wording.
The next step after revising the content is editing. When you edit, you examine the surface features of your text. You examine your spelling, grammar, usage, and punctuation. You also make sure you use the proper format when creating your finished assignment.