Peavey Electric guitar Owner's Manual page 20

String Action
String action refers to the distance between the
strings and the frets on a stringed instrument. Peavey
technicians carefully set optimal string action on every
guitar before it leaves our factory; however, changes in
temperature and moisture (humidity), changing string
gauges, making neck adjustments or tuning can alter
string action enough to require a height adjustment to
restore your guitar to factory specifications. Undesirable
low action causes buzzing, while abnormally high action
makes your guitar difficult to play.