According to wikipedia: PostgreSQL, often simply Postgres, is an object-relational database (ORDBMS) — i.e. a RDBMS, with additional (optional use) “object” features — with an emphasis on extensibility and standards compliance. As a database server, its primary function is to store data securely, and to allow for retrieval at the request of other software applications. It can handle workloads ranging from small single-machine applications to large Internet-facing applications (or for data warehousing) with many concurrent users.

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