What role does Profile play in determining access to custom objects?

The role of a Profile in determining access to custom objects is fundamentally linked to the concept of Object Permissions. A Profile in Salesforce defines what users can do with a custom object, including whether they can create, read, edit, or delete records associated with that object. When a user is assigned a Profile, they inherit permissions set at the Profile level, which governs their ability to interact with custom objects.

This means that if a custom object is included in a user's Profile settings, that user will have the permissions specified for that object. Hence, Profiles are crucial for enforcing data access and ensuring that users can access or manipulate data according to the permissions granted to them through their Profile.

While Field-Level Security, page layouts, and record visibility based on Profile settings are also important aspects of Salesforce security, they do not fundamentally change the inherent object access granted by the Profile. Field-Level Security pertains to individual fields rather than the object as a whole, page layouts influence how records are displayed to the user but do not affect access, and visibility of records is typically managed through additional sharing rules rather than just the Profile itself.

Thus, understanding that Profiles regulate Object Permissions establishes a clear connection to how access is determined at a broader level within Salesforce.