6. useRef

import { useRef } from "react";
 
function InputFocus() {
  const inputRef = useRef(null);
 
  const handleClick = () => {
    inputRef.current.focus();
  };
 
  return (
    <div>
      <input ref={inputRef} type="text" />
      <button onClick={handleClick}>Focus Input</button>
    </div>
  );
}