Say it like this

What is left over after you pay for everything it took to make the thing.

For the grown-up

Profit is revenue minus cost. It is the part children skip straight past, because a lemonade stand that took four dollars of lemons to earn five dollars feels like five dollars until somebody does the subtraction out loud.

The easy mistake

Careful here. Money coming in is not profit. Doing that subtraction out loud once, with real numbers from a real lemonade stand, teaches more than any definition.

Words next to this one

Business Somebody fixing a problem for somebody else, who says thank you with money. Price How much money somebody is asking for a thing. Not the same as what it is worth to you. Money A way to trade what you have for what you want, without having to find one person who has both. Value How much something is worth to you. It can be different for two people looking at the same thing. Invest Using something valuable now, hoping it becomes more valuable later. It might not.