With around 19% market share, high-profile companies like PayPal, GitLab, MasterCard, Atlassian, Microsoft, Linkedin, and many others using it, PostgreSQL is out there with other top relational database management systems.
It is particularly popular with traditional internet companies which deal with software and communications equipment, and kind of popular among small and medium-sized businesses.
It is an extension of the SQL database management language, with add-ons for handling extremely complicated data workflows. The PostgreSQL architecture has been proven to be amazingly reliable, with solid data integrity, and a rich set of useful features.
PostgreSQL is open-source, free to download, use and modify, and it is the system of choice for many developers who build reliable applications, have no margin for mistakes, and need to protect data integrity above all else. Relational databases typically don’t meet all the features of SQL – the fundamental database management language – but PostgreSQL is compliant with over 160 (out of 179) SQL features.
This system gives PostgreSQL developers the ability to extend its functionality through adding new features, and using pre-defined APIs.
It is scalable both in terms of the number of users it can serve efficiently, and the amount of data that it stores.