You can think of a Document as a conventional sheet of paper. Like a sheet of paper, you can draw lines and write text (and erase them later). You can save the document for later use by storing it on disk or printing it. Unlike conventional paper, the computer provides you with many extra options. You can move objects around on the document just by grabbing them and sliding them around, even over other objects. You can copy objects and reuse them, either in the same document or in a different document.