The USB is an interface plug & play between the PC and certain devices such as keyboards, mice, printers, modems, sound cards, digital cameras, etc, which in the past were connected in a different way eg via serial or parallel ports , which need different drivers to function and were much slower rate as transfer is concerned. This interface is also widely used in data storage devices such as the safety device or that our PC is locked and can not access our information as we can name several benefits the Port USB: 1 – One of the most important features is that it allows devices to work at speeds averaging about 12 Mbps, which is more or less than 3-5 times faster than a parallel port device and 25 to 40 times faster than a device serial port. 2 – It has a simple connection, since it only has one type of cable, so virtually no record errors when installing the printer, camera or even a storage device such as a, since only one type of cable (AB USA) with different connectors on each end, so it is impossible to connect incorrectly. 3 a “It’s multiplatform, it can be used on different operating systems like Windows, Linux or OS2 and different hardware platforms such as PC or MAC. This greatly benefits the compatibility, which eliminates the risks in their bids for a range of products, enabling manufacturers to create innovative combinations of PC, peripherals and software that meet the needs of specific market segments. Recall that in the past, each device had a different port, parallel printer port, mouse, serial port, as well as the keyboard using a port other than named ps / 2. 4 – It is Plug and Play, which is when we connect a printer or scanner through the USB interface, no need to shut down the computer to detect the new hardware because the system the connected device automatically recognizes and installs the appropriate drivers, which allows it to be hot plug-gable, meaning that the user can connect and disconnect USB devices whenever you want without having to power cycle the machine. 5 – It is of great benefit to people with less experience in the computing world as to connect certain devices such as a network card or modem, if you had years ago or whether to resort to open the CPU to install the device, this is much easier and simpler because now these devices are connected externally via USB. 6 – USB technology allows connections running, so that users can easily incorporate a printer and when needed, in USB, you can connect up to 127 devices to our computer. The picture shows a device for connection to expand the number of devices.