PostgreSQL is a high level relational database management system, which you can use on many platforms (UNIX, Linux, FreeBSD, OpenSolaris, Windows) and with a number of scripting languages (Perl, PHP, Python, Java, Ruby). Because it's open-source, it may be freely modified to suit the requirements of any developer who works with it. PostgreSQL is also one of the most reliable and stable database systems, with better functionality in handling complicated operations when compared with similar systems. It is appropriate for large-scale applications because a single PostgreSQL database doesn't have a limit for the size, while a single table can be up to 32 GB. It's not a surprise that a lot of business, academic and governmental entities are already employing PostgreSQL - Skype, the University of California, Berkeley and the US Department of Labor being only a couple of examples.