To depict something. For example, an HTMLauthor creatively renders text and graphics on a Web page into columns and rows, and a browser automatically renders the Web page by interpreting the HTML code. In graphics, rendering is the conversion of an outline drawing into a fully formed, 3-D image (which often takes a great deal of time to complete).
Common language usage includes, "That project was such hard work, it rendered me useless for the whole weekend." A "render farm" is slang for the graphic arts division of a company, or for the actual room in which a bunch of graphic artists work their magic.