ETL is a data optimization process that provides data converting into a digestible form.

The typical ETL process is considered to consist of three main stages.

They are extract, transform, and load.

The question of how to build an ETL process arises when there’s a necessity for it connected with the business.

To achieve it, you need to follow four basic steps, which are copying raw data, filtering it, transforming, and, finally, loading it into a warehouse.

Besides, ETL development is tightly connected with the tools you choose.

One of the main matters to think about is deciding between open-source and licensed tools.