Contract is a standard object that represents a contractual agreement between your company and a customer. Case is a standard object that represents a customer's question or problem that needs to be resolved by your support team. Account is a standard object that represents an individual or an organization involved in your business, such as customers, competitors, partners, etc. These three objects are commonly used for service use cases in Salesforce. Reference: https://help.salesforce.com/s/articleView?id=sf.contract_fields.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.case_fields.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.account_fields.htm&type=5

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