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Authentication verifies who you are, while authorization determines what you can do.

OAuth 2.0 lets apps access user data securely without passwords.

Consistency models determine what data reads in distributed systems can see.

Zero Trust Architecture ensures that no user or device is trusted by default.

Access tokens are short-lived tokens for API access, while refresh tokens renew them without re-login.

Secure API design requires multiple strategies to protect sensitive data and access.

The CAP Theorem explains the trade-offs in distributed systems during network failures.

Token expiration and refresh token rotation secure user sessions by limiting token lifespan and preventing unauthorized access.

OpenID Connect allows apps to authenticate users and verify their identities securely.

Optimistic and pessimistic locking are strategies to manage database access during concurrent transactions.

Choosing the right boundaries for microservices is crucial for effective architecture.

Choosing the right distributed lock depends on your system's needs and existing tools.

mTLS allows microservices to verify each other's identities using certificates.

CSRF tricks your browser into making requests without your consent.

SSRF is a vulnerability where an attacker tricks a server into making unintended requests.