单点登录的英文名称为Single Sign-On，简写为SSO，它是一个用户认证的过程，允许用户一次性进行认证之后，就访问系统中不同的应用；而不需要访问每个应用时，都重新输入密码。IBM对SSO有一个形象的解释“单点登录、全网漫游”。-Single sign-on of the English name for the Single Sign-On, abbreviated as SSO, it is a user authentication process that allows the user after a one-time authentication to access the system in different applications　without the need for access to each application, are re- Enter a password. IBM has an image on the interpretation of SSO " single sign-on, full-network roaming."