Slide Guitar – A guitar technique in which a metal or glass tube placed on the finger is slid across the strings to create a glissando effect
(Pronounced slide guh-tar)
To remember what slide guitar is, it's essentially in the name:
Sliding a metal or glass tube along the guitar strings while plucking them creates a sound that can continually shift between notes.
When using a slide, not every string must be played. Individual strings can be plucked or multiple strings can be strummed. This technique allows for a unique glissando effect on the guitar, which is the seamless transition between notes.
This is a top-down view of a slide placed on the strings. It does not need to be pressed into the frets as the finger normally would, but glides over them while in contact with the strings.
The slide technique is commonly used in blues and country music, and can be played on acoustic or electric guitars.