You may not be surprised to learn, therefore, that its use has largely been superceded by more recent features, particularly Polar Tracking, described below.
Also, it does a very simple job it constrains drawn lines to the horizontal or the vertical. It is either on or it is off and there are no special settings to make. Ortho mode is probably the simplest of all the drawing aids, and historically one of the oldest. Turn Ortho mode on now and draw some lines to get a feeling for how it works. With Ortho mode turned on you can only draw lines which are either vertical or horizontal. Using Ortho is the equivalent of using your parallel motion and set square on a drawing board. Finally, you can also type ORTHO at the command prompt as in the command sequence below.
Ortho can also be toggled on and off using the F8 Function key (see Function Keys below for more details). In the illustration, Ortho is turned on but Grid and Snap are turned off. You can see how this appears by looking at the status bar illustration below. When Ortho is turned on, the ORTHO button appears pressed in. The appearance of the button tells you whether Ortho is currently turned on or turned off. The quickest way is just to click on the ORTHO button on the status bar. Ortho mode can be toggled on or off in one of three ways. Like the other options on the status bar, Ortho is not really a command, it is a drawing mode which can either be turned on or off. Ortho is short for orthogonal, which means either vertical or horizontal. If you ever get stuck, think how you would complete a task on a drawing board and then look for a similar way to do it with AutoCAD. This means that in many respects, the drawing techniques are very similar. Just as you have a parallel motion and set squares to help you draw horizontal and vertical lines on a drawing board, AutoCAD has similar drawing aids which can help you to draw horizontal and vertical lines on a computer. In fact, many of the drawing aids that AutoCAD provides are analagous to traditional drafting tools. Most newcommers to Computer Aided Design assume that they will need to learn how to draw all over again. Drawing with AutoCAD is really just like drawing on a drawing board.
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