PostgreSQL is a powerful, open source object-relational database system with more than 15 years of active development and a strong development community. PostgreSQL’s proven architecture has earned it a strong reputation for reliability, data integrity, and correctness. PostgreSQL’s source code is available under the PostgreSQL License, a liberal open source license, and developed by the PostgreSQL Global Development Group, similar to the MIT License.
PostgreSQL evolved from the Ingres project at the University of California, Berkeley. In 1982, the project leader, Michael Stonebraker, left Berkeley to make a proprietary version of Ingres. He returned to Berkeley in 1985 and started a post-Ingres project (POSTGRES) to address the problems with contemporary database systems that had become increasingly clear during the early 1980s. The POSTGRES team released version 1 of PostgreSQL to a small number of users in June 1989. In 1996, the project was renamed to PostgreSQL to reflect its support for SQL. The first PostgreSQL release formed version 6.0 in January 1997.
Today, PostgreSQL is made available and maintained by the PostgreSQL Global Development Group. The PostgreSQL Global Development Group continues to make major releases (approximately annually) and minor “bugfix” releases available under the PostgreSQL License. The PostgreSQL code contributions come from a world wide active community that includes proprietary vendors, support companies, and open-source programmers at large.