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Abstract: Nowadays in today’s digital world, everyone uses different applications forvarious purposes. To use these application services the user must have its login credentials.The user uses so many applications, for that purpose user needs different username and passwords for every application. It is difficult to remember this username and passwords.This led to the concept of a single sign on (SSO). SSO is an implementation of single a step of authentication which allows a user to use all system applications. SSO manages a user centrally. It has large productivity. The SSO system does not centralize account information for all application rather than it stores account information in a single account. Security Assertion Markup Language (SAML) is used in Single sign on protocol. This paper presents review on a Li et al’s scheme and dynamic ID based scheme using smart cards for multi-server environments and discuss architecture, protocols, benefits, analysis related to SSO.The combination of SSO with Multi Factor Authentication (MFA) helps to reduce the risk ofan authentication.