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What is PostgreSQL?
PostgreSQL (pronounced "post-grey-sequel") is a sophisticated, standards-based, Object-Relational database management system (DBMS) supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. Initially developed at the University of California at Berkely in the late 1970s and early 1980s, PostgreSQL is, today, the most advanced open-source database server in the world, designed primarily for e-business and enterprise applications.

Why do people use PostgreSQL?
- SQL 92 compliant
- An enhancement of the Postgres DBMS, a next-generation research prototype
- Retains the powerful data model and rich data types of Postgres while replacing the PostQuel query language with an extended subset of SQL
- A very viable alternative to the market-leading proprietary databases in terms of performance and scalability
- PostgreSQL has consistently performed an average of four to five times faster than every other database in a variety of tests administered by an independent technology solutions company
- In benchmark tests, maintained a consistent output level whether there were one or two simultaneous users
- PostgreSQL significantly outperformed both the leading commercial and open-source applications in both speed and scalability

PostgreSQL is free, and the complete source is available.