voltage follower and current follower

Wat is ment by current follower and voltage follower circiut

A voltage follower is just a circuit where the input voltage is equal to the output voltage. It is also called a buffer and is used to produce the same voltage, but with larger current capability and lower output impedance.

I don't think there is such a thing as a current follower. A current mirror maybe. It's just a current source that has an output equal to the current being measured somewhere else.

thanks a lot

and do u know how exactly a transistor works
text books always confuse me a lot

u can also direct me to a website regarding this

*exactly* is a loaded word. Textbook confuses me too.

Knowing that an ideal voltage follower has unity gain, infinite input impedance, and zero output impedance, then a current follower should have unity (current) gain, zero input impedance, and infinite output impedance. Just as an common collector stage (emitter follower) is the single-transistor approximation of a voltage follower, a common-base stage is the single-transistor approximation of a current follower.
An op amp with unity feedback is, of course, a very good approximation of a voltage follower. The only IC I am familiar with that is close to a current follower is the LM13700, which is a really cool part for an analog geek like me.