The Role object represents a role of a User.

The User object represents a User.

Accounts represent the companies or organizations that you are in contact with. Accounts have one or more Contacts associated with them.

Attachments are the files associated with a ticket or a comment.

Tickets can be grouped into Collections. Collection resource usually maps to the various grouping systems used in the underlying product. Some examples are lists, projects, epics, etc. You can differentiate between these grouping systems using the type attribute of a Collection.

Comments represent the communication happening on a Ticket, both between a User and a Contact and the internal things like notes, private comments, etc. A Ticket can have one or more Comments.

Contact represent the external people you are in contact with. These could be customers, leads, etc. Contacts can be associated with an Account if the underlying product supports it.

Core resource which represents some work that needs to be carried out. Tickets are usually mapped to issues, tasks, work items, etc. depending on the underlying product.

Ticket Status represents the completion level of the Ticket. Some products provide customizing the Ticket Status.

Users represent the people using the underlying ticketing system. They are usually called agents, team members, admins, etc.