LDAP integration vs. SSO ServiceNow what is the difference?

LDAP integration means that your Service-Now instance will pick up newly created Users from the Active Directory, either through Listener ports or through Scheduled Uploads, and when you authenticate yourself while Logging onto Service-Now, this authentication is happening from the AD.

SSO implemented means that you do not have to re-authenticate yourself when trying to access ServiceNow, once you log into an Environment while accessing different Applications for whom SSO is enabled