React: What is React useId?

1import { useId } from "react";
2
3function FormField({ label }) {
4  const id = useId();
5  return (
6    <div>
7      <label htmlFor={id}>{label}</label>
8      <input id={id} type="text" />
9    </div>
10  );
11}

1// Manual — may collide
2const id = "input-" + counter++;
3// useId — guaranteed unique
4const id = useId();