What are the different levels of scope for beans in the Spring Framework?

In the Spring Framework, the following main scope levels for beans exist:

• singleton (default) — one instance of the bean for the entire Spring container.
• prototype — a new bean instance is created each time it is requested.
• request — the bean lives for the duration of a single HTTP request (for web applications).
• session — the bean is tied to a user session.
• application — the bean exists within the scope of the ServletContext.
• websocket — the bean lives for the duration of a WebSocket session.

The choice of scope depends on how long the bean should exist and how it is used in the application.