What is the difference between state and props?
Props come from the parent and are read-only inside the child. State is owned by the component and can be changed by it. Props are external inputs; state is internal memory.
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More FAQs in What Is State in React and Why It Drives Interactivity
State is internal data managed by a component that can change over time. When state changes, React re-renders the component so the UI reflects the new data. It is what makes React apps interactive.
Because React's model is that the UI is a function of state. When state changes, React re-renders the component and any children that depend on it so the UI stays in sync with the new data.
No. State updates are asynchronous and batched for performance. Reading state right after calling the setter shows the old value, which is a common source of beginner confusion.
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