Laptop - Notebook

What they do
They are small computers that can be easily carried with you everywhere you go.
 
Quality to consider before purchasing one
1) Display. A dispaly of excellent quality is essential, otherwise text and images will be slightly out of focus, coulours washed out and you will be unable to work comfortably. You will also need to put the dispay at an appropriate angle to see it.
2) Performance. This can vary according to your need. Nevertheless, you'd better have a video card with a dedicated RAM and at least 512 RAM for the pc. In addition, if you aim for the best quality and performance, go for a 7200 Hard Drive (possibly with Intel Mobile Pentium-M processor with Centrino technology).
3) Weight and dimensions. As we'll be carrying the laptop around, we have ensure that both its weight and dimensions are right for us. These will vary according to personal need. However, a would suggest a weight below 3.5 Kg.
4) Autonomy. With some current models, autonomy lasts for 3 or more hours (sometimes up to 4 hours). Unless your laptop has a reasonable autonomy, you'll be forced to use a main power point.
 
The cost of a good laptop is between 1200 and 2300 USD, depending on dimensions and characteristics. You can find cheaper ones if you don't mind to giving up to a good amount of performance, including a good video card.
Brands to keep in mind (Notebooks and laptops sale)

Dell, Toshiba, Sony, Asus, Acer, Compaq.