What is the difference between a lightweight Subnotebook and an Ultrabook?

[joseph_clivinstein]

I will be buying small and compact computers for coworkers for their ability to work on the go. While searching I saw Ultrabooks and Subnotebooks, They both had similar specs. I wanted to know the difference between both a Subnotebook and an Ultrabook. PLEASE RESPOND ASAP.

 

[Reynod]

Essentially a subnotebook is supposed to be a small low spec device whilst an Ultrabook is supposed to offer high end performance in terms of processor speed, graphics and memory, but in an ultralight weight device.