Props or properties are the inputs or the arguments passed to a component. State, on the other hand, is the internal data managed by a component that can change over time. So, Props are like function arguments and state is like local variables inside a function.

Treat props as immutable which means read only. Even if you try to change it, nothing is gonna happen. But it's anti-pattern in React. This is based on functional programming principles.

State, on the other hand is mutable. And, that's the whole purpose of using state variables. We want to tell React that this component has data that can change over time.

One common thing - Anytime state or props change, React will cause a re-render and update the DOM accordingly.