The answer
Anything: strings, numbers, arrays, objects, functions, or even other React elements. Passing functions as props is how a child component communicates events back up to its parent.
What Are Props in React and How Do They Work?
What can be passed as props in React?
More FAQs in What Are Props in React and How Do They Work?
Props are inputs passed from a parent component to a child component. They work like function arguments: the parent passes values, and the child receives them as an object and uses them to render.
Yes. A child should never modify its own props. Props flow down from the parent. If data needs to change, the parent updates it and passes new props down. This one-way data flow is core to React.
No. Mutating props breaks React's one-way data flow and does not behave the way beginners expect. If you need data that changes over time inside a component, that is state, not props.
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