Applications are generally accessible through application dispersion stages, which started showing up in 2008 and are commonly worked by the holder of the versatile working framework, for example, the Apple App Store, Google Play, Windows Phone Store, and Blackberry App World. A few applications are free, while others must be purchased. Normally, they are downloaded from the stage to a target gadget, for example, an iphone, Blackberry, Android telephone or Windows Phone, however at times they can be downloaded to laptops or desktop machines.