ETL is short for extract, transform, load — three database functions that are combined into one tool to pull data out of one database and place it into another database.

“A properly designed ETL system extracts data from the source systems, enforces data quality and consistency standards, conforms data so that separate sources can be used together, and finally delivers data in a presentation-ready format so that application developers can build applications and end users can make decisions” (Wikipedia).

“ETL can be contrasted with ELT (Extract, Load, Transform), which transfers raw data from a source server to a data warehouse on a target server and then prepares the information for downstream uses” (TechTarget).

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