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There are two kinds of current mirrors, sources and sinks. Applications are very wide is one of the basic and most used electronica blocks, that includes biasing, and active loads, etc etc.
As other wrote one currente mirror is when both curent are equal, but there are variations when whe have a relation 1:2, 1:5, 1:20 etc.
You can open a datacheet of any analog device and you can find current sources, and current mirrors.
electronics_kumar:
current mirror circuits are very much used in the fabrication of Opams and based on the use, widely there are just couple of them which you can find in any electronics book and basically if you are comfortable with Transistors then, you can undderstand them
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