In this handbook on databases, the complex world of computer applications used for storing, managing, and accessing information is broken down in an easy-to-comprehend format. Concrete examples of physical and online databases that readers will already know coupled with explanations of how more advanced databases work will help the reader grasp digital information storage on all levels. With sidebars on topics such as Structured Query Language (SQL) and how databases are used in social media, as well as a chapter dedicated to data security, this book is certain to help young readers learn the essentials of using and understanding database technology.