Represents an individual account, which is an organization or person involved with your business (such as customers, competitors, and partners).
Represents and tracks a marketing campaign, such as a direct mail promotion, webinar, or trade show.
Represents a case, which is a customer issue or problem.
Represents a contract (a business agreement) associated with an Account.
Represents an event in the calendar. In the Salesforces user interface, events are referred to as activities.