The Apple Pro Training Series OS X Server 5.0 Essentials is a comprehensive textbook written by Arek Dreyer and Ben Greisler, focusing on using and supporting OS X Server on El Capitan. Published by Peachpit Press in 2016, this trade paperback contains 720 pages of essential information for those interested in operating systems, particularly Apple’s Mac OS and iOS. The book is part of the Apple Pro Training Series, making it a valuable resource for students and professionals looking to deepen their understanding of OS X Server.