Business
Say it like this
Somebody fixing a problem for somebody else, who says thank you with money.
For the grown-up
A business creates something a customer values more than the money they hand over, at a cost lower than that price. The gap is what keeps it alive. The problem-first definition is the one worth giving first, because it is the one a child can immediately test against every shop they walk past.
The easy mistake
Careful here. A business is not a building. Plenty of them have no building at all, and a child who defines business by premises will struggle with most of the modern economy.
The full explanation
What Is a Business?
A glossary entry is the short version. This one has the child explanation, the grown-up explanation, the questions and an activity.
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