See also: Application
An extremely useful program. The Holy Grail of every technology company to produce at the right time for the right cost. Most killer apps now appear on the Internet as opposed to being a downloaded program.
- Social networking services such as Friendster
- Google - a powerful, effective, innovative, and high-speed system that has proven very lucrative for its parent company and the envy of the Internet tech world.
- iTunes and its accompanying music purchase system.