All users in your organization with access to Salesforce CRM require a username, an e-mail address, a password, and a profile along with an active user license.
Depending on the features your organization has purchased, you may have user options such as Marketing, Service Cloud, Mobile, and so on. which give particular users the ability to access other features that are only available with a specific user license. A user can be assigned to one or more of these options.
You can also create and manage other types of users outside your organization by applying appropriate licenses that provide limited access to your Salesforce organization.
In association with the user license, you can govern all users' access to data ...