A user license determines the baseline of features that the user can access. Every user must have exactly one user license. You assign user permissions for data access through a profile and optionally one or more permission sets.
Available in: Salesforce Classic
Edition requirements vary for each user license type.
For example, if you assign a Force.com user license to Employee A and a Salesforce user license to Employee B, you can give “Read” access on cases only to Employee B. Employee A’s user license doesn’t support standard object permissions for anything but accounts and contacts.
You might see other types of licenses listed if your company has purchased custom user licenses for different types of functionality. Your organization might also have other licenses that are still supported but no longer available for purchase. Contact Salesforce for more information.
The following license types are available only for organizations currently using a Customer Portal or partner portal. If you don’t have a Customer Portal or partner portal but want to easily share information with your customers or partners, see Communities User Licenses.
Authenticated Website User Licenses Platform portal users have the Authenticated Website license, which is designed to be used with Force.comSites. It gives named sites users unlimited logins to your Platform Portal to access customer support information.