Profit

Etymology

From Latin "profectus" (progress, advance), from "proficere" (to make headway) — pro "forward" + facere "to make or do". Profit originally meant advancement or benefit of any kind before narrowing to financial gain. At root it names moving forward, not merely money.

noun · /PROF-it/
The money left over after all costs are subtracted from what a business earns.
What it names
The bottom-line test of whether an activity actually makes money — what remains for the owner once every bill is paid.
Example
After rent, wages, and supplies, the café’s profit was thinner than the busy tables suggested.
Related idea
Distinguish margin: profit is an absolute amount of money, while margin is that profit as a percentage of sales — a shop can earn a large profit on thin margins, or a small profit on fat ones.