Describe different OAuth 2.0 flows and their appropriate use cases.

OAuth 2.0 has multiple authorization flows:

• Authorization Code Flow: Ideal for server-side applications where the client needs to securely receive tokens without exposing client secrets.
• Implicit Flow: Suited for public clients (e.g., Single Page Applications) as it grants immediate access but exposes tokens in URLs, which should be avoided if possible.
• Resource Owner Password Credentials Flow: Best for trusted applications (like a first-party application) where the application collects user credentials directly.
• Client Credentials Flow: Used for service-to-service authentication where user approval isn't required.
• Choosing the right flow depends on the application architecture, security requirements, and user experience considerations.