About This page covers the PostgreSQL Database Server, and explains how to use Webmin to manage tables, users, groups and data. Intro Like the MySQL Database Server, PostgreSQL is a free database server that supports multiple databases and tables, and allows clients to query them with SQL. It is most useful for programmers writing applications that need to use a database to store information. Popular languages like Perl, C, Java and PHP all have APIs for accessing a PostgreSQL database.