Mobile phones were becoming pocket computers long before Apple unleashed the iPhone, but Apple's handset has undoubtedly introduced people to the possibilities of the touchscreen.

In the United States, Apple has started an aggressive marketing campaign for its touch-screen, tablet-style computer.

Apple on Wednesday launched the iPad, a lightweight tablet with a 9.7-inch touchscreen display that brings together web surfing, books, movies and music in an easy-to-carry device.