Single sign-on (SSO) is a type of authentication that allows users to access multiple applications and services with a single set of credentials. This eliminates the need for users to remember and manage multiple usernames and passwords, and makes it easier for them to access the applications and services they need. SSO is often used in enterprise environments, where employees need to access a variety of applications and services as part of their job. It can also be used by consumers to access a range of online services, such as social media, email, and cloud storage. SSO is typically implemented using a central authentication service that manages the authentication and authorization of users across multiple applications and services.