React - useState

useState is a React Hook that lets you add a state variable to your component.

const [state, setState] = useState(initialState)

In my experience it is mainly used when the current component needs to be re-rendered to make some changes to the UI

Reference

import { useState } from 'react';

function MyComponent() {
  const [age, setAge] = useState(28);
  const [name, setName] = useState('Kelvin');
  const [todos, setTodos] = useState(() => createTodos());
  // ...