Piriform is a privately owned software company based in London, England. Founded in 2004, the company markets their software products worldwide. Their most popular product is CCleaner, which has been downloaded more than 1 billion times and is estimated to be in use on roughly 25 percent of all Windows personal computers in the world. This program is used to clean up hard drives by removing temporary files, history, cookies and other unnecessary data that can slow performance. In addition, Piriform offers Defragger, a utility program for defragging hard drives to optimize their performance; Speccy for hardware analysis and Recuva, a data recovery program.