Communication and interactive tools often based on the Internet. Communication tools typically handle the capturing, storing and presentation of communication, usually written but increasingly including audio and video as well.
Applications typically developed by a company other than the phone provider and designed to be used specifically on the iPhone or Droid phone. The Apps work much like user-installed software on a computer and allow the phone to perform specific tasks that the user wants or needs.
The use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet).
An emerging class of software applications that help businesses unlock the value of their "Line of Business" systems and turn document-based processes into real applications.