DITA (Darwin Information Typing Architecture) is an XML markup language created by IBM and used by many technical communication groups. DITA content is most often created as a task, concept, or reference topic.
How it is useful to technical communicators:
DITA is useful to technical writers and their businesses because it allows for single-sourcing and content reuse. DITA also allows the writer to focus solely on the content as formatting is determined by the output format.
Where you can learn more about it:
What is DITA and why should you care?
DITA Open Tool Kit (for creating DITA outputs)
Other software like it: