A React Hook that lets your component remember and update a value between renders.
useState is the most fundamental React Hook. It lets you add state (changeable data) to function components. When you call useState, it returns two things: the current value and a function to update it.
useState triggers re-renders when state changes. You use it for form inputs, toggles, counters, loading states, and any data that changes over time. Multiple useState calls manage multiple pieces of state. For complex state, Zustand or useReducer may be better.
useState manages application state — different from CSS states (visual conditions like hover/focus). useState is how React tracks and updates dynamic data in your UI.
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