PostgreSQL is a high level relational database administration system, which you can use on many platforms (UNIX, Linux, FreeBSD, OpenSolaris, Windows) and with many different scripting languages (Perl, PHP, Python, Java, Ruby). As it's open-source, it can be easily modified to fit the needs of any developer who uses it. PostgreSQL is also one of the most reliable and stable database systems, with far better functionality in managing complicated procedures compared to similar systems. It is well suited for large-scale apps since a single PostgreSQL database doesn't have a limit for the size, while an individual table could be up to 32 Gigabytes. It is not a surprise that a lot of business, educational and government entities are already using PostgreSQL - Skype, the University of California, Berkeley and the US Department of Labor being a few examples.