The process of migrating data into a Drupal database from a CSV file can be fulfilled through Drupal’s integrated Migrate API and three extra custom modules (Migrate Source CSV, Migrate Plus and Migrate Tools). 

This is known as the ETL (Extract - Transform - Load) process, in which data is fetched from one source in the first step, transformed in the second step, and finally loaded to its destination on the Drupal database in the third step. 

This tutorial will explain the creation of 12 book nodes for a library database.  Keep reading to learn how!