The service seems to be abandoned: the apps are no longer updated since 2012/2013, the Android application is no longer available on the Google Play Store and the Facebook page has been closed. The Windows app can be still bought from the official website.
Babylon is the easiest way to translate a word. With just a click you can find translations from different dictionaries and different languages. The premium version offers more features such as Human Voice (text to speech), Premium Dictionaries, Unlimited document translations, Unlimited text translations and more. The company also offers language learning tools and more.