A USB hub has additional ports that you can use to connect external devices to your computer. While the high-end computers can give the user a generous number of ports, low-cost desktop systems and many laptops provide only a single USB connection, which makes a very useful hub.You can choose a USB hub or a non-powered hub, both have advantages and disadvantages depending on your individual needs. Unpowered hubs
All USB ports are powered in some way. The built-in on a computer USB ports are powered by the computer itself and do not require an external power source. A non powered USB hub works the same way, the power from the computer. The downside is that your laptop battery life can be significantly reduced. These platforms allow generally USB can be connected up to four devices, and each device adds to the power on the computer.
A USB hub plugs into an electrical outlet and is fed by this source rather than the computer. Large devices such as printers and scanners make their own electricity from a power outlet it is therefore no real advantage to use a hub USB powered for these components, a non powered hub work just as well.However, a powered hub is a good choice, but you want to connect a number of small USB devices to your laptop.
Advantages and disadvantages
According to the Chinese manufacturer, powered hubs USB will prolong the life of your laptop battery by reducing the draw draw from devices connected to the hub, but these centres are more expensive than non-powered units. For large devices which have their own power, and for desktop computers, the two types of hub will allow enough.Professionals, will find hubs USB more convenient to connect several small devices such as digital cameras and flash drives to a laptop.