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(Extract, Transform, Load) The functions performed when pulling data out of one database and placing it into another of a different type. ETL is used to migrate data, often from relational databases into decision support systems.

ETL, EII and EAI
ETL differs from EII (enterprise information integration), which aggregates data temporarily from disparate data sources, and EAI (enterprise application integration), which integrates data from one application to another. See EII and EAI.