The Palm-Muting Technique

Obviously, depending on the hand position and the pressure applied on the strings, it can result in different sound​​s (light to heavy mutin).

Not much to explain about that, just follow the hand position below:

Although palm-muting is mainly used on electric guitar, it provides interesting sounds on acoustic guitar as well, including a rather punchy sound.

Palm-muting is symbolized by the "PM ------>" mention (or something like that) under the tab.