In ____, analysis and validation of the data pattern and formats will be performed, as well as identification and validation of redundant data across data sources to determine the actual content, structure, and quality of the data.

ETL Testing is a process of verifying the accuracy of data that has been loaded from source to destination.

An ETL tool extracts the data from all these heterogeneous data sources, transforms the data (like applying calculations, joining fields, keys, removing incorrect data fields, etc.), and loads it into a Data Warehouse.