The lap steel guitar, also known as a Hawaiian guitar, is a type of steel guitar without pedals that is typically played with the instrument in a horizontal position across the performer's lap. Unlike the usual manner of playing a traditional acoustic guitar, in which the performer's fingertips press the strings against frets, the pitch of a steel guitar is changed by pressing a polished steel bar against plucked strings. Though the instrument does not have frets, it displays markers that resemble them. Lap steels may differ markedly from one another in external appearance, depending on whether they are acoustic or electric, but in either case, do not have pedals, distinguishing them from pedal steel guitars.

A steel guitar is any guitar played while moving a steel bar or similar hard object against plucked strings. The bar itself is called a "steel" and is the source of the name "steel guitar". The instrument differs from a conventional guitar in that it is played without using frets; conceptually, it is somewhat akin to playing a guitar with one finger. Known for its portamento capabilities, gliding smoothly over every pitch between notes, the instrument can produce a sinuous crying sound and deep vibrato emulating the human singing voice. Typically, the strings are plucked by the fingers of the dominant hand, while the steel tone bar is pressed lightly against the strings and moved by the opposite hand.