What is the Zachman Framework for enterprise architecture?

The Zachman Framework is a two-dimensional classification scheme for organizing the descriptive representations of an enterprise. It uses six communication questions as columns: what, how, where, who, when, and why. And six perspectives as rows: planner, owner, designer, builder, subcontractor, and user. The intersection of each column and row produces a unique artifact that describes one aspect of the enterprise from one perspective.