Slide guitar is a technique used in playing the guitar where a smooth object, called a slide, is placed on the strings. This allows the player to create a gliding sound, producing unique pitches and expressive tones. The slide can be made from various materials, such as glass or metal, and is typically worn on a finger. This style is commonly associated with genres like blues, country, and rock music. Notable musicians, such as Duane Allman and Robert Johnson, have popularized slide guitar, showcasing its emotional depth and versatility. The technique adds a distinctive character to guitar performances.