Okta provides a single sign-on (SSO) service that allows users to log in to different systems using a centralized process. In addition to SSO, it provides multiple other services such as Universal Directory, Identity Governance, Multi-factor Authentication, and Access Gateway.
Okta provides secure SSO access to hundreds of supported SaaS apps via OIN (Okta Integration Network). OIN integrations often use OpenID Connect (OIDC) and SAML, but SWA, or proprietary APIs for SSO are also usable. The vendor maintains all provisioning APIs and SSO protocols internally.