MySQL is a database management system that allows the storage and retrieval of data in databases for use on a website. All sites developed by intraspin.com use a database.
PHP is a server side language that executes any processing of data from the website and when putting together a webpage requested by the user. intrasin.com has a solid understanding of the PHP language and object-oriented programming in general, as discussed in 3.4 Custom Application Development Approach and Experience, and particularly with WordPress.
WordPress is an open-source content management system on which intraspin.com is expert, having built both internal and client projects as well as releasing plugins used worldwide to extend its core functionality. Please see further detail under 3.3 Content Management Approach and Experience.