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An amplifier (in the context of Folk)  is any device which takes an acoustic signal (a sound) and reproduces it louder. 

A gramophone horn and a Guitar's body are both examples of passive amplifiers. A passive amplifier is one where no energy is required to make the amplifier work.

Mostly, when we talk of amplifiers, we mean electronic amplifiers which require that a sound is converted to an electrical signal, fed into the amplifier which then creates a copy of that signal many times larger before being output.

Input devices tend to be Pick Ups for Instruments and Microphones for Voices and Acoustic Instruments. Output tends to be a Loudspeaker or Headphones.

The Amplifier is most often employed in a Public Address System.