**By wrapping `handleSubmit` in `useCallback`, you ensure that it's the *same* function between the re-renders** (until dependencies change). You don't *have to* wrap a function in `useCallback` unless you do it for some specific reason. In this example, the reason is that you pass it to a component wrapped in [`memo`,](/reference/react/memo) and this lets it skip re-rendering. There other reasons you might need `useCallback` which are described further on this page.
**By wrapping `handleSubmit` in `useCallback`, you ensure that it's the *same* function between the re-renders** (until dependencies change). You don't *have to* wrap a function in `useCallback` unless you do it for some specific reason. In this example, the reason is that you pass it to a component wrapped in [`memo`,](/reference/react/memo) and this lets it skip re-rendering. There are other reasons you might need `useCallback` which are described further on this page.