Universal Serial Bus (USB) is a serial bus standard for connecting peripherals to a host. It was designed to connect devices with a standard interface and improve the plug-and-play capabilities of the devices are connected or disconnected without restarting the computer or device off. This bus can connect peripherals such as mice, keyboards, game controllers, scanners, digital cameras, printers, digital media players, flash drives and external hard drives. USB is the standard connection method for most electronic devices. To date, billions of these devices are included in the electronic marketplace.The USB Implementers Forum Inc. (USB-IF) is a nonprofit organization founded by leading companies in the computer industry and electronics. The organization was established a support group and forum for the promotion and adoption of USB technology. The Board of Directors is currently composed of the following companies: Hewlett-Packard, Intel Corporation, LSI Corporation, Microsoft Corporation, NEC Corporation and ST-Ericsson.

USB 1.0 and 1.1
USB 1.0 in 1994 with two data rates, low speed (1.5 Mbps) and Full-Speed (12 Mbps). It is designed to replace the many connections on the back of the computer software to simplify configuration and communication devices. The 1.1 specification was released in 1998 and was the first revision is widely adopted.

USB 2.0
The USB 2.0 specification was published in 2000 and has been standardized by the USB-IF in 2001. Several companies have led the initiative to develop a higher data transfer rate of 480 Mbps, about 40 times faster than the 1.1 specification. Also known as Hi-Speed USB 2.0 variety of external devices that can be used on a computer. And provide compatibility with previous generations.

USB On-The-Go
Many laptops are USB devices, and there is a growing need for devices to communicate directly with each other, without a computer. The On-The-Go Supplement allows devices to communicate directly with each other. On-The-Go features include:

- Limited capacity to communicate with some USB devices
- A small connector suitable for mobile form
- Low power consumption for maintaining the life of batteries
- Ability to host or peripheral, and to change dynamically between the two.

Wireless USB
Wireless USB is a short distance, high bandwidth technology of wireless radio communication originally developed by the Wireless USB Promoter Group and managed by the USB-IF. Designed from the ground up to meet the challenges of wireless communications and personal networks, these standard combines the speed and security of wired technology and convenience of using wireless technology. It can be used in devices such as game controllers, printers, scanners, digital cameras, digital music players, hard drives and flash drives. May He also parallel video streams.

It is adapted from the date of dispatch at a rate up to 480 Mbit / s at 3 meters and 110 Mbps at 10 meters. It was designed for 3.1 to 10.6 GHz. The wireless architecture allows up to 127 devices to connect directly to a host. With the elimination of son, a hub is not necessary. A future specification 1.1 Wireless will increase the data speed of 1.0 Gbit / s per second.

USB 3.0
In November 2008, USB 3.0 Promoter Group announced the completion of the 3.0 specification. It offers transfer speeds up to 10 times faster than USB 2.0 using a rate of 5.0 Gbit / s data. In addition, optimized energy efficiency, Sync-n-go technology that minimize users wait and backward compatibility with USB 2.0. Super-Speed USB 2.0 compatible with platforms and Super Speed USB Host Hi-Speed support legacy devices.

NEC Electronics has recently announced the first USB 3.0 host controller (number μPD720200). With its high-speed data transfer, the new Super Speed host controller is only 70 seconds to 25 GB HD-video, the equivalent of a Blu-Ray disc. Transfer contents to 14 minutes with Hi-Speed USB.

Advances in USB technology will lead to a new generation of high performance consumer electronics products. For help of Super Speed, Super Speed USB Platform Integration Lab (PIL) is now open for the USB-IF members. The PIL Super Speed USB 3.0 offers developers the opportunity to test interoperability and receiving device. For more information, visit the PIL test.

USB connector
USB connectors are designed for ease of use. Overall, the trident logo on the face when the connector plug into a port. The connectors are designed to be durable and easy to install / remove. Different types of connectors server functions. Standard-A is often taken permanent cables to devices such as keyboards or mouse. The Type B connector plugs-in typical devices with detachable cables, such as a printer. USB connectors have evolved and less as a consumer electronic devices are also smaller. The current standard connector for smaller devices like mobile phones and cameras, mini-B connector.

USB logos
For a company to use a USB logo, the product must meet, as evidenced by the Program for testing. Companies must also implement a licensing agreement to benefit from the brand logo. If a certification logo on a product, consumers know that the product has passed the standards set by the USB-IF.