PostgreSQL is a high level relational database management system, that you can use on a variety of platforms (UNIX, Linux, FreeBSD, OpenSolaris, Windows) and with various scripting languages (Perl, PHP, Python, Java, Ruby). As it's open-source, it may be freely modified to match the requirements of any developer who employs it. PostgreSQL is also among the most trusted and stable database systems, with superior efficiency in managing complex operations when compared with similar systems. It is well suited for large-scale applications as a single PostgreSQL database does not have a limit for the size, while a single table may be up to 32 Gigabytes. It isn't surprising that a number of business, educational and governmental entities are already using PostgreSQL - Skype, the University of California, Berkeley and the US Department of Labor being a few examples.