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PostgreSQL is a relational database management system that is an extension of SQL. It incorporates many features that allow secure storage and scalability of complex data sets.
PostgreSQL is a reliable system that can take care of data integrity, making it an excellent tool for database administrators. There is a large open source community associated with PostgreSQL, which is constantly developing it and adding needed functionality. Many indexes in the system have defined APIs, so you can build on top of PostgreSQL what you need at the moment.