Netbooks (also called mini-laptops or umpc - ultra-mobile pc) are small portable computers, similar to notebooks but smaller and with less on-board computing power.
A netbook typically weighs less than 3 pounds (or 1.3 kg) and has a smaller screen (5 to 10 inches) and keyboard. Most netbooks do not have DVD or CD drives and are intended for connecting to the internet via built-in ethernet, wi-fi or GPRS/3G mobile technologies.
Another key difference between netbooks and notebooks is the price - netbooks are usually significantly less expensive that notebooks and highly portable. That makes netbooks ideal for people on the go who experience a lot of travels and don't want to spend a bulk of money on a tech-gadget.