A case consists of multiple articles. An article goes through a channel.
All request are named case. In other systems this is also called issues, ticket, etc.
channel Channels are the incoming and outgoing ways where articles flow. There are assigned to groups. Channels can be e-mail, chat, twitter, etc. New channels can be added via the plugin mechanism.
group
A group is a structure element like a container where cases are assigned to. A case can only be assigned to one group.
Organizations are used to group users. The common use case is to group the employees of a company to one organization.
overview Overviews are configurable lists of cases. There are system wide overviews, defined by an administrator and user defined. They are available for all roles.
role
All permissions are role based. Access to groups are assigned to a role and also specific actions on requests depending on a users role.
While writing an article are textmodules available to assist the agent's work.
Every persons which are used in Zammad are called person. Each person needs a minimum of one assigned role. Three roles are predefined: Administrator, Agent, Customer