Profiles confirm the scope of a user's access in a Salesforce ORG. Because the first portion of the question is so IMPORTANT, Yes. A single profile is issued to a large number of users. A comparable profile will be issued to the ENTIRE TEAM. The admin will create a single profile called Sales Profile, which will have access to Leads, Opportunities, CAMPAIGNS, Contacts, and other corporate items. This signifies that a similar profile has been assigned to a number of people. If the team leader or manager needs access to additional records or objects, distribution permission sets are created specifically for those users.