Apple Ipad (2010)

Apple did it again in 2010 with the launch of its tablet PC, the iPad. It was by no means the first device of its kind, but it succeeded in capturing the public's imagination, and kickstarted a new trend. It has remained the single most popular tablet PC ever since, but Android overtook Apple iOS to become the number one tablet operating system in terms of user numbers earlier this year, thanks to a wide variety of cheap alternatives.

Source: http://www.telegraph.co.uk/technology/picture-galleries/11298840/Most-important-inventions-of-the-21st-Century-in-pictures.html