What is a Slide Deck?
Many people ask - why do we call a PowerPoint presentation a "slide deck"? The term evolved from a set of slides in a projector tray - the slides collectively were called a slide deck (as in a deck of cards).
On a side note, one of the early projectors the allowed folks to watch slides consecutively was featured in a Mad Men episode:
It’s a time machine,’ Don Draper says. 'It takes us to a place where we ache to go again. It’s not called the wheel.’ Dramatic pause. 'It’s called the Carousel.