This document provides an introduction to MySQL, an open source relational database management system. It discusses that MySQL is pronounced "my-es-que-el" and includes both a SQL server and client programs. It also summarizes that MySQL AB is the commercial entity behind MySQL that provides marketing, development, services, support and consulting. Additionally, it notes that MySQL is the most popular open source database with over 100 million downloads, it is certified for SAP applications, and is widely used by developers along with PHP and Apache.