Folk Instruments are generally instruments made by the indigenous peoples of a country. In the U.S. these generally include things like acoustic guitars, banjos, basses, drum kits, mandolins, ukuleles, and fiddle.
Where I'm from there is a folk instrument that is very interesting called a "charengo". It's similar to a mandolin if a mandolin was inside out!
Folk music varies greatly from place to place so if there's somewhere you love, lets learn to play their