An extremely lightweight personal computer or a small compact portable computer typically weighs less than 5 pounds and is small enough to fit easily in a briefcase for those users who are constantly on the move. Aside from size and portability, the main difference between a notebook computer and a personal computer is the display screen - laptop computers are bit larger than notebooks.

Lightweight laptops come with battery packs that enable you to run them without plugging them in. However, the batteries need to be recharged every few hours.

Weight may be an important factor to consider when buying your laptop if you are travelling a lot and will be carrying it with you. Of course if your laptop will be sat on a desk at home most of the time, the weight will not be as relevant for you - just remember that the lighter the laptop the lighter your pocket will be (as most lightweight laptops require more advanced power systems to keep them featherlight).