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

Mar 26, 2018
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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.
 
Solution
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.