PostgreSQL is a sophisticated relational database management system, which can be used on a variety of platforms (UNIX, Linux, FreeBSD, OpenSolaris, Windows) and with various scripting languages (Perl, PHP, Python, Java, Ruby). Since it's open-source, it can be easily modified to fit the demands of any developer who employs it. PostgreSQL is also among the most efficient and stable database systems, with a lot better functionality in managing complicated operations compared to similar systems. It is well suited for large-scale applications since a single PostgreSQL database doesn't have a limit for the size, while an individual table may be up to 32 GB. It's not a surprise that a lot of business, educational and governmental entities are already using PostgreSQL - Skype, the University of California, Berkeley and the US Department of Labor being only a couple of examples.