Which of the following describes ETL? a) A process that transforms information using a common set of enterprise definitions b) A process that loads information into a data warehouse c) A process that extracts information from internal and external databases d) All of these are correct.

The correct answer is d) All of these are correct.

Explanation:

ETL stands for Extract, Transform and Load. An ETL system extracts data from the sources, enforces data quality and consistency standards, conforms data so that separated and maybe unrelated sources can be used together, and as a final step delivers data in presentation-ready formats so that developers can build applications and end users can take decisions.