React hooks are functions that allow you to use state and lifecycle features in functional components. Before hooks, these features were only available in class components.
Common hooks include useState, useEffect, useContext, useReducer, etc.

• useState: Lets you add state to functional components.
• useEffect: Performs side effects, such as data fetching, subscriptions, and DOM manipulations.
• useContext: Accesses the React context, allowing you to share data between components without prop drilling.
• useRef: Creates a mutable ref object that can hold a reference to a DOM node or any other value.
• useMemo: Memoizes expensive calculations, preventing unnecessary re-renders.
• useCallback: Memoizes functions, preventing unnecessary re-renders of child components.