what is the different between computers and devices and why? what is computer science and how is it important in computing?

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jothi krishnan Profile
jothi krishnan , http://www.cmtes.com/course/certification-in-database-management-systems, answered

When referring to a computer a device is any
  internal or
  external
  hardware
  peripheral that attaches to a computer to send, receive,
  or process data. For example, a
  printer
  is an example of a device, although more appropriately referred to as a
  peripheral.

but individually a device can refer to any electronic device including a
laptop, tablet,
and smartphone.

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