Cydia


Cydia

Open source software for iPhones that allows the installation of third-party applications that come from sources other than Apple's App Store. Cydia, along with an earlier "installer.app" program, were available even before the App Store debuted in 2008. In order to use Cydia, named after the destructive Cydia pomonella moth found in apple orchards, the iPhone's restrictions must be overridden (see iPhone jailbreaking).