Revenue
Also called: sales, top line, turnover
Revenue is the value of goods and services sold in a period, recognised when earned rather than when paid. It's the top line because everything else is subtracted from it. The subtleties that matter are gross versus net presentation — a marketplace booking $100 of sales it merely facilitates versus the $10 commission it keeps — and whether growth is coming from volume, price or acquisitions.
Where this is taught
Definitions are the trailer. These free levels turn Revenue into something you play — one bite-size lesson, with worked examples, a quiz and XP.