Workitems are used for tracking work within TFS.
Workitems are used to track work within TFS. They have state and a process for changing state and ownership.
Workitems come in many different types. Work items share several properties: like owner, state, area and iteration; and have type-specific properties: estimated time remaining, number of points, or name of reviewer.
A TFS Team Project is configured with a process template, e.g.: the Agile Process, SCRUM, or CMMI. The process template defines a set of Work item types, the fields and states that the work items can have.
Workitems can be heavily customized to suit the local development process.