In React, state and props are both used to manage data, but they serve different purposes: State: State is a component's internal data storage. It is managed within the component and can be changed by the component itself. When the state changes, the component re-renders to reflect those changes. Props: Props are short for properties. They are read-only and are used to pass data from a parent component to a child component. Props help make components reusable and customizable.