Until relatively recently, giving a presentation with slides or any kind of media meant hooking a laptop up to a projector. Classrooms were filled with VGA cords and, latterly, HDMI cables and to make things more complicated, no two laptops seemed to have the same type of ports.
Most teachers dreaded presenting in a new room—there was the chance all the preparation they had done for the lesson might not actually make it to the screen.
Walk into most of today’s lecture theatres and classrooms, however, and the cables have gone. They’ve been replaced with wireless presentation solutions.