Что (кто) такое PostgreSQL - определение

FREE AND OPEN-SOURCE RELATIONAL DATABASE MANAGEMENT SYSTEM

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PostgreSQL

<database> /'post-gres-kyu-el/ An enhancement of the POSTGRES database system. PostgreSQL is an advanced {relational database management system} with some object oriented approaches. PostgreSQL is developed and distributed as free software, and while retaining its freedom it remains technically and featurewise a worthy competitor to even the most advanced commercial alternatives. It was also one of the first databases to offer MVCC as opposed to row-level locking or table locking, thereby greatly improving multi-user performance. PostgreSQL implements an extended subset of ANSI SQL and runs on many platforms. It also has interfaces to many different programming languages and database protocols, like ODBC and JDBC. http://postgresql.org/. (1999-09-18)

POSTGRES

<database> An active DBMS developed at the {University of California at Berkeley} by a team led by Michael Stonebraker (1986-1994). Postgres was later taken by Illustra and developed into a commercial product, which in turn was bought by Informix and integrated into their product, {Universal Server}. PostgreSQL is a further development of the original POSTGRES code as a free software alternative to commercial DBMS vendor offerings. [Details? Reference? Relationship to Ingres?] (1999-07-04)

Википедия

PostgreSQL

PostgreSQL (, POHST-gres kyoo el), also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance. It was originally named POSTGRES, referring to its origins as a successor to the Ingres database developed at the University of California, Berkeley. In 1996, the project was renamed to PostgreSQL to reflect its support for SQL. After a review in 2007, the development team decided to keep the name PostgreSQL and the alias Postgres.

PostgreSQL features transactions with Atomicity, Consistency, Isolation, Durability (ACID) properties, automatically updatable views, materialized views, triggers, foreign keys, and stored procedures. It is designed to handle a range of workloads, from single machines to data warehouses or Web services with many concurrent users. It was the default database for macOS Server and is also available for Linux, FreeBSD, OpenBSD, and Windows.

https://en.wikipedia.org/wiki/PostgreSQL