Fields are, simply put, containers for information. You could say that users, tickets, and organizations are objects in Zendesk; each containing a range of fields to hold the information describing the object.
Let's have a quick look at an example field:
This field called Requester is a ticket field as it belongs to the ticket object. Every ticket requires a requester. In most cases, the requester would be an end user.
Another great example would be the Description field, which holds the initial text provided by the requester of a ticket. The content of some ticket fields is supplied by the end-user who created the ticket. In direct contrast, the Assignee field, holding the information about what group or agent the ticket is assigned to, is set within Zendesk. In this case, the end user does not supply the information:
