The profile defines the level of access a user can have in Salesforce.
In Salesforce org, it is possible to assign a single profile to any number of users. For example, we can consider a sales or service team in a company. The entire team has access to the same profile. The admin can create one profile for the whole sales team, which will have access to the leads, campaigns, contacts, and other objects deemed necessary by the company.
In this functionality, many users can be assigned with the same profile. In case the team leader needs access to additional records, then it can be done by assigning permission sets only for those users.
Each user can be assigned only one profile.
