PostgreSQL is a high level relational database administration system, which can be used on many platforms (UNIX, Linux, FreeBSD, OpenSolaris, Windows) and with a variety of scripting languages (Perl, PHP, Python, Java, Ruby). Because it's open-source, it can be freely modified to suit the needs of any developer who works with it. PostgreSQL is also amongst the the most dependable and secure database systems, with better functionality in handling complicated operations when compared with similar systems. It's suitable for large-scale apps due to the fact that a single PostgreSQL database does not have a limit for the size, while a single table can be up to 32 Gigabytes. It isn't surprising that lots of business, educational and governmental entities are already working with PostgreSQL - Skype, the University of California, Berkeley and the US Department of Labor being just a couple of examples.