Ory is a suite of independently deployable, cloud-native identity and access management services written in Go, including Kratos for registration and login flows, Hydra for OAuth2/OpenID Connect, Keto for Zanzibar-style fine-grained permissions, and Oathkeeper as a zero-trust access proxy. Because each component is headless and API-first, engineering teams can replace homegrown authentication or costly platforms like Auth0 while keeping full control over UI, data residency, and infrastructure.