Ortho command in CAD: to turn on or turn off straight drawing system (horizontal or vertical) when drawing commands in cad. Specially it is usually used for line or pline command.
Command: Osnap
Menu: tools=>> Drafting setting
Shortcut key: F8 or Ctrl+L
To turn on or turn off this system, we usually use the shortcut key F8

Thanks for reading and good luck!

You can see more commands in AutoCAD… here