Intel defines an ultrabook as an ultra-portable computer based on its processor architecture and running the Windows operating system. See:

See also: In January Intel CEO that demand for ultrabooks would be huge and take as mnuch as 40 percent of the laptop market.

"I have not seen this level of excitement in our customer base since before Centrino," Otellini said in a January 19, 2012, earnings call with analysts.

However, uptake of thin and light portable computers during the first half of 2012 was disappointing, though new data from market intelligence firm ABI Research forecasts 20 million will ship worldwide in 2012.

Targeted at mid-range prices, the most popular ultra-portable today is Apple's distinctly non-Windows MacBook Air. The Air does, of course, feature an Intel processor.