What's the difference between an Ultrabook laptop and a Notebook laptop?

Q. I'm looking to buy a new laptop. Please give specific, informative and accurate details. No links please!
Thanks :)

A. An Ultrabook is a higher-end type of subnotebook defined by Intel. Intel claims a trademark in the name Ultrabook. Ultrabooks are designed to feature reduced size and weight and long battery life while retaining strong performance. They use low-power Intel CULV processors with integrated graphics, solid-state drives for fast loading times, and unibody chassis to fit larger batteries into smaller cases. Because of their minimal size, the ability to have many ports (USB, HDMI, VGA, ethernet, etc) is limited.

By this marketing initiative and an associated $300 million fund, Intel hopes to influence the slumping PC market against rising competition from tablet computers, which are typically powered by competing ARM-based processors.

A laptop, also called a notebook, is a personal computer for mobile use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a trackpad, and/or a pointing stick) and speakers into a single unit. A laptop is powered by mains electricity via an AC adapter, and can be used away from an outlet using a rechargeable battery.

What is the main difference between ultrabook and laptop?

Q. Hi, i want to buy a new laptop, should i buy ultrabook? What is the main difference? Thanks

A. The most important difference - it's size. Ultrabook has a size as a netbook or tablet, but it has a very high performance.
I really like this picture compare laptop and ultrabook http://ultrabooksreview.com/buying-advice/laptops-and-ultrabooks-a-world-of-difference/

What is the best ultrabook laptop?

Q. I need to buy a laptop for school but I want in ultrabook. I want to spend at least less than $900 and I want the screen to be 14'' or less. I don't want an Asus, or Lenovo. I was thinking to the lines of HP, Samsung or even Dell. It has to be at least 4GB with 500MB and may be more than 6 hrs of battery life.

Could some please tell me? I'm a computer major in college. I've been surfing the web for quite awhile about it but I still can't decide.

A. The HP envy series looks awesome. Or the Dell XPS 13. There was a lenovo ultrabook (forgot what, but it wasn't that great).

(Why not Asus? They are the most reliable major computer manufacturer and offers the awesome Zenbook Prime!)