SSO, or Single Sign On, is a technique where-by one (or more) applications can automatically recognize a user as logged in when that user has logged in elsewhere. You can implement single sign on with IPS Community Suite by letting a remote application recognize a user who has already logged in to the IPS Community Suite as being logged in within the remote application, or by using a plugin with the IPS Community Suite to have it check for users logged in already through an external application.
