Mobile apps can be used for a wide range of applications:
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'A mobile application (or mobile app) is a software application designed to run on smartphones, tablet computers and other mobile devices.
They are usually available through application distribution platforms, which are typically operated by the owner of the mobile operating system, such as the Apple App Store, Google Play, Windows Phone Store, and BlackBerry App World.
Some apps are free, while others must be bought.
Usually, apps are downloaded from the platform to a target device, such as an iPhone, BlackBerry, Android phone or Windows Phone, but sometimes they can be downloaded to laptops or desktops.'
See the Mobile App Reference List in Wikipedia.
The American Dialect Society named “app” the word of the year for 2010.
'The popularity of mobile apps has continued to rise, as their usage has become increasingly prevalent among mobile phone users. A May 2012 comScore study reported that during the previous quarter, more mobile subscribers used apps than browsed the Web on their devices: 51.1% vs. 49.8% respectively. Researchers found that usage of mobile apps strongly correlates with user context and depends on user's location and time of the day.'
'The explosion in number and variety of apps made discovery a challenge, which in turn led to the creation of a wide range of review, recommendation, and curation sources, including blogs, magazines, and dedicated online app-discovery services.' (Source: Wikipedia)
According to market research firm Gartner, 102bn apps will be downloaded in 2013 (91% of them will be free).
David Pogue (technology columnist) suggested the name 'app phones' to distinguish the newer smartphones from earlier less sophisticated smartphones.