What is PostgreSQL ?
PostgreSQL is developed by the PostgreSQL Global Development Group, a diverse set of several firms and individual contributors. It’s absolutely free and open-source, released under the terms of the PostgreSQL License, a permissive software license.
PostgreSQL is ACID-compliant and untrue. PostgreSQL has updatable views and materialized views, triggers, foreign keys; supports functions and stored procedures, along with other expandability.
It can manage workloads ranging from small single-machine applications to big Internet-facing applications (or for data warehousing) with many concurrent users. It is the default database on macOS Server and can be available for Microsoft Windows and Linux (provided in most distributions).