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  1. ETL, which stands for extract, transform and load, is a data integration process that combines data from multiple data sources into a single, consistent data store that is loaded into a data warehouse or other target system.

    In computing, extract, transform, load ( ETL) is the general procedure of copying data from one or more sources into a destination system which represents the data differently from the source (s) or in a different context than the source (s). The ETL process became a popular concept in the 1970s and is often used in data warehousing.

    en.wikipedia.org/wiki/Extract,_transform,_load
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