When it comes to data technology, are you lost in translation? What's the difference between data federation, virtualization, and data-as-a-service? Are columnar databases also relational? These questions are just the tip of the iceberg when it comes to terms and definitions in the world of enterprise data. This report defines the Forrester data taxonomy — categories, components, definitions, and aliases — and provides a common language for enterprise architecture (EA) professionals to communicate consistently. This is an update to a previously published report; Forrester reviews and revises it periodically for continued relevance and accuracy.