This is a Bus with which peripherals such as mice, keyboards, scanners, KeyDrives, Scanners, Printers, and DigitalCameras etc can be to attached to a computer. USB provides power from the host computer. It also allows devices to be "chained". As a result, instead of having a mess of cables into the back of your computer, you could theoretically have your monitor and printer plugged into the computer, your scanner into the printer, your keyboard and camera into the monitor, and your mouse into the keyboard. So far, this scenario is purely theoretical.
Many USB devices can be mounted under linux so that it becomes part of your filesystem. Examples include many USB cameras, and USB/flash-based MP3 players/memory sticks.
usb 1-2.2: new full speed USB device using address 10 scsi2 : SCSI emulation for USB Mass Storage devices Vendor: JetFlash Model: Transcend Rev: 0100 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 507392 512-byte hdwr sectors (260 MB) sda: assuming Write Enabled sda: assuming drive cache: write through sda: sda1 Attached scsi removable disk sda at scsi2, channel 0, id 0, lun 0 USB Mass Storage device found at 10
This shows that a fake SCSI disk has been attached (named "sda"), and it has one partition (sda1) that you can mount.
# mkdir /media/usb
/dev/sda1 /media/usb auto defaults,user,noauto,noatime 0 0
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