Describes an information need and use this description as a basis to create and maintain a document.

A documentation module is a fragment which is usually transcluded by other documents. The lifetime of a module document is independent of the lifetimes of the documents that reference it.

Sections of a document are typically part of a document. But the size of sections may vary. To support a team to write collaboratively on the documentation, a larger document may be subdivided into external section documents.

Describes a single step of an activity. A step is a generic document that is associated with a document that describes a process. It may be a test log or a howto.

A description of a given topic. A topic may describing or explaining a concept, a task to accomplish or a reference. There are a couple of topic types that set the expectations for the reader. Instances of the topic doctype usually have independent lifetimes from any referencing documents.