Single sign-on, or SSO, lets employees use one secure login to access many different work applications instead of a separate password for each one.
SSO connects your apps to one trusted identity provider. An employee signs in once, and that login grants access to every connected tool, so there are fewer passwords to remember and fewer to reset.
For HR and IT, SSO matters most during onboarding and offboarding. Access can be granted to all the right tools on day one through a single setup, and removed everywhere the moment someone leaves, which closes a common security gap.