Postgresql is a relational database management system (RDBMS) that is similar to MySQL and Oracle. It allows for storing and retrieving data with an emphasis on extensibility and standards compliance. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX), and Microsoft Windows. It is an open-source, object-oriented database management system. PostgreSQL supports a number of different programming languages, including SQL, PL/pgSQL, C++, Python, and Java.
It is more powerful than other databases because it supports complex queries, joins, and aggregates. PostgreSQL has a rich set of features including full ACID transactions, foreign keys, and extensible data types. It s open-source and free to use.