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The Zoom command has 11 options. The most important ones are described in this list:

  Extents and All: The Zoom Extents button (with the four-headed arrow and the magnifying glass) zooms out just far enough to display all objects in the current drawing. The Zoom All button (the sheet with the folded-over corner) does almost the same thing: It zooms to display the rectangular area defined by the drawing limits set with the LIMITS command, or it zooms to show the extents — whichever is larger. These two options are especially useful when you zoom in too close or pan off into empty space and want to see the entire drawing again. Limits and extents are slightly different. Limits are set by the Limits command. You can configure AutoCAD to not allow you to draw anything outside the limits, but this usually causes more problems than it solves. Extents are defined by the smallest imaginary rectangle that will just surround every object in your drawing. A good April Fool’s trick is to sneak up to another person’s computer and draw a tiny circle by typing the location coordinates as something like 10000,10000. The next time the person does a Zoom Extents, the drawing will seem to disappear. Use Zoom All or Zoom Extents and then save the drawing before you close it to ensure thatThe next person who opens the drawing can see the full drawing as soon as the person starts working.ssss1 A menu for magnifying.Any objects that you accidentally copied beyond the drawing limits show up so that you can delete or move them.The drawing preview that appears in the Select File dialog box and on the Start screen displays the full drawing rather than a tiny, unidentifiable corner of it.