SAML (Security Assertion Markup Language) and OAuth are both standards for managing access between apps and services, but they serve different purposes. SAML is used in authentication and identity federation to allow users to log in once and access multiple services, often in enterprise or corporate scenarios. OAuth handles authorization only and grants apps limited access to user data without sharing passwords. While both are commonly used in Single Sign-On (SSO), they approach it differently. SAML provides a direct SSO experience for enterprise applications, while OAuth can be part of an SSO solution when combined with protocols like OpenID Connect. SAML is an XML-based open standard for exchanging authentication and authorization data between an Identity Provider (IdP) and a Service Provider (SP). It uses assertions to represent authorization and authentication data. OAuth, on the other hand, is an authorization framework that lets apps obtain limited access to user data on other apps without having to expose user credentials. SAML is best suited for enterprise apps where employees need to access a suite of applications from a single place. OAuth is commonly used for delegated access, allowing users to log into your app using their existing social media accounts or letting your app act on a user's behalf in other services.