De Qual é a diferença entre notebooks, netbooks e PCs ultra-móveis? / a>:
The answer to these questions depends upon whom you ask. One person may call a particular PC a netbook while another insists it's a notebook. It's like asking someone to describe an elevated geographic feature -- some may call it a hill and others insist it's a mountain. There's no universal definition upon which you can rely.
There are, however, some general guidelines we can use. Laptop computers, notebooks and netbooks use the same basic form factor -- the main differentiator is size. That form factor is a computer with two main parts: a screen and a keyboard attached by hinges. In general, netbook computers are smaller and lighter than notebook computers, which in turn are smaller and lighter than laptops. But there are no specific size or weight classes for computers. So, for example, if the computer has an 11-inch (27.9 centimeter) screen, is it a netbook or a notebook? That's where people disagree.
Outro ponto é que um netbook tem garantia de conexão sem fio, enquanto um notebook não é (apesar de praticamente todos eles fazerem hoje).