All the steps in an ETL process can, of course, be carried out manually, but the margins for error are particularly wide. In the age of Big Data, companies are collecting ever more data, and for many, manual processing would require the mobilization of a large number of employees. An automated process enables better control of data, greater agility thanks to the centralization of the ETL process within a single software package, better sharing with the company's various departments, and greater accuracy.