#Hooks

Discuss key React and JavaScript concepts including the difference between Virtual DOM and Real DOM, the behavior of setTimeout in a single-threaded environment, and hooks like useCallback, useMemo, and useEffect. Additionally, explain the URL typing process and write a custom useState hook.

What is the difference between useMemo and useCallback in React?

What is the useCallback() hook in React, and when is it used?

What is a hook in React? Provide examples and explain how they work.

When have you used custom hooks in your projects? Provide examples if possible.