PostgreSQL is a high level relational database administration system, which can be used on a number of platforms (UNIX, Linux, FreeBSD, OpenSolaris, Windows) and with a variety of scripting languages (Perl, PHP, Python, Java, Ruby). Due to the fact that it's open-source, it could be easily modified to fit the requirements of any developer who uses it. PostgreSQL is also one of the most efficient and stable database systems, with significantly better performance in handling sophisticated procedures when compared with similar systems. It's well suited for large-scale apps because a single PostgreSQL database doesn't have a limit for the size, while an individual table could be up to 32 GB. It isn't surprising that many business, academic and governmental entities are already employing PostgreSQL - Skype, the University of California, Berkeley and the US Department of Labor being a few examples.