Advanced technologies undeniably developed in the 4th Industrial Revolution era, and led to incessantly growing volumes of information daily. “Big Data” is simply information surplus due to the volume, velocity, variety, variability and veracity of the data that need to be processed to get value and better visualisation. Big Data helps libraries understand the ever-changing users’ needs, consequently reshaping their services and procedures. However, it offers several information challenges concerning its capturing, storage, searching, structuring, and visualization. This paper, explores the concept of Big Data in a library environment, how to introduce Big Data, its benefits in the library, roles of librarians in Big Data, the required skills for librarians to work in the data-intensive era and ethical considerations for Library Big Data.