PostgreSQL, often referred to simply as "Postgres," is a popular open-source relational database management system (RDBMS). It is known for its stability, robustness, and support for a wide range of advanced features, making it a popular choice for large-scale, high-performance applications.
PostgreSQL was first released in 1996 as an Open Source project by the PostgreSQL Global Development Group. It is a fork of work done on Ingres and later Postgres which were research projects at the University of California, Berkeley. Since then, it has evolved into a mature, enterprise-grade database system that is widely used in both commercial and open-source software applications.