Illustrator allows you to draw objects in perspective, using traditional drawing elements of Vanishing Points and Perspective planes. This allows for many realistic perspective drawing scenarios from illustrations of buildings and streetscapes to packaging concepts in perspective, to technical drawings.
To draw in perspective you must first show the perspective grid, either One point, Two point or Three point perspective. The perspective grid can be edited to suit your needs by using the Perspective Grid Presets or by manually adjusting the grid's vanishing points, horizon and planes to suit.
With a perspective grid edited you can then begin to draw and move existing objects into the different perspective planes. When doing this all objects created and moved into a perspective plane will automatically do so in the angles of that perspective plane, giving the effect of true perspective drawing using the angles of the vanishing points and planes. This gives a dimension to illustrations that the human eye is used to seeing as depth or perspective.