Probably you didn't realise and know about USB technology.
Below are the types of USB today.
USB "A" connector (Picture sourced from howstuffworks.com)
This is the most common type of USB you will see among most peripherals.
This part connects to the computer USB port.
USB "B" connector (Picture sourced from howstuffworks.com)
This connector is always on the other end of the "A" connector to connect to the peripheral itself.
This part connects to the USB device. For example, printers, scanners etc.
USB "A" connector to USB "MINI" connector (Picture sourced from mercadolibre.com.ec)
This is a typical cable to connect a mobile device to a computer vis USB. This USB "MINI" connector connects to the mobile devices such as MP3 Players, Digital Cameras, Mobile Phones, etc.
USB "A" Port (Picture sourced from crutchfield.com)
This is a USB "A" port that you oftenly see on the computer itself.
USB "B" Port (Picture sourced from allerc.com)
This is a USB "B" port that you will find it on the USB devices.
USB "MINI" Port (Picture sourced from atmarkit.co.jp)
This is a USB "MINI" port that you will find it on mobile devices.
To find out more about USB technology and how it works, visit
http://computer.howstuffworks.com/usb.htmPoint to NoteUSB - Universal Serial Bus
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