The experimental library for Next.js makes it easier to use Apollo Client with the App directory in Next.js 13. The main feature is the introduction of React Server Components, which allows data fetching on the server, removing the need for client-side fetches in most cases. The library provides a way to get an instance of Apollo Client every time it's needed and makes sure that only one instance is created per request. It also handles caching for Next.js and provides a `useSuspenseQuery` hook for streaming SSR rendering. With this library, you can use Apollo Client in both Server Components and Client Components, making it easier to manage data fetching and caching in your Next.js application.