Teams are a feature available on the account object and the opportunity object. For accounts, it is called account teams and for opportunities, it is called sales teams. Teams allow you to add users to specific accounts and opportunities. They consist of specific users and the record owner can set access to the record for each specific user.
Team access
A business use case
You are the Salesforce admin for XYZ Widgets. The sales manager wants an account team, which consists of an engagement manager and a support specialist, to have access to certain accounts. The account record owner should be able to add two users to the team and grant the engagement manager read-only access while granting the support specialist read/write...