# Part 5 - OAuth Grant Types
OAuth Simplified 5 / 5
9 min read
Client Credentials for machine-to-machine calls, and Device Authorization for devices without a browser.
/ tags/ Authentication
# Part 4 - The OAuth Authorization Server
OAuth Simplified 4 / 5
27 min read
How the Authorization Server registers clients, issues Authorization Codes and tokens, enforces PKCE, and what it stores and checks at every step.
# Part 1 - Introduction To OAuth
OAuth Simplified 1 / 5
10 min read
Why OAuth exists, the four components it introduces, and how delegating access works without ever handing over your password.