Can you explain what PostgreSQL is and how it is used in data storage?

PostgreSQL is an open-source object-relational database management system (DBMS). It is used for storing, managing, and processing structured data. PostgreSQL supports complex queries, transactions, indexes, extensibility, and ensures data reliability and integrity.

In data storage, PostgreSQL allows creating tables with various data types, establishing relationships between tables (via foreign keys), and executing queries for data retrieval, updates, and deletions using SQL. Thanks to support for extensions and user-defined functions, PostgreSQL is suitable for a wide range of applications — from simple websites to complex analytical systems.