What is the difference between a Data Lake and a Data Warehouse?

A data lake is a vast pool of raw data, the purpose for which is not yet defined. A data warehouse is a repository for structured, refined data that has already been processed for a specific purpose. The two types of data storage are often confused but are much more different than they are alike.

Cirium Sky for Airline Operations is a data warehouse purpose-built for airline operations use-cases.  The data is cleaned, normalized and structured to provide operational analysts with access to schedules, flight status (both near-Realtime and historical), SWIM information and METAR weather.