the.com/elevator pitch

means A short, persuasive summary of an idea, business, or yourself, designed to be delivered in the time it takes to ride an elevator.

from American business jargon from the 20th century, built on a simple scenario: you step into an elevator with someone important — an investor, a boss — and have only the length of the ride to make your case before the doors open and your chance is gone. The term crystallized the idea that persuasion should be compressed to its essential core, no filler, no second floor to spare.