Props: Props are used to pass data from a parent component to a child component. They are read-only, meaning that the child component cannot modify the props it receives. They are intended to be immutable. Props are useful for making components reusable and for providing external data to a component.
State: State is used to manage the internal data of a component. Unlike props, state is mutable and can be changed within the component using the setState method (in class components) or the useState hook (in functional components). State is meant to store dynamic data that can change over time and affect the rendering of the component. State changes trigger component re-renders, which means that when the state changes, the component updates to reflect those changes. It’s worth noting that with the introduction of React Hooks, functional components can also maintain state using the useState hook. Class components, on the other hand, use the this.state approach to manage state.
In summary, props are used for passing data from parent to child components, and they are read-only. State is used for managing internal component data, and it is both readable and writable. This separation helps create a clear hierarchy of data flow in your React application.