what is current mirror? & what are it's applications?

What is current mirror, how it works, it's characteristics , advantages and applications?

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Current mirrors as the name suggests copies the current so as to supply nearly constant current to a load over a wide range of load resistances. The copied current is sometimes said to be Time-varying.  Conceptually, an ideal current mirror is simply an ideal inverting current amplifier that reverses the current direction as well. Or it can be visualized to contain a current-controlled current source (CCCS). It is majorly used to avail bias currents to active loads in circuits which eventually finds applications in differential amplifier and operational amplifier and many basic electronics can be used to achieve a current mirror circuit like transistors, MOSFETs etc.

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