Best Answer: Bridges for electric guitars can be divided into two main groups, "tremolo" and "non-tremolo" (also called hardtail). Tremolo bridges have an arm (called the tremolo or whammy bar) that extends from below the string anchoring point. It acts as a lever that the player can push or pull to change the strings tension and, as a result, the pitch. This means that this type of bridge produces a vibrato rather than tremolo, but the term is deeply entrenched in popular usage. Non-tremolo bridges supply an anchoring point for the strings but provide no active control over string tension or pitch. A small group of tremolo bridges has an extended tail (also called longtail). These guitars have more reverb in their sound, because of the string resonance behind the bridge. The Fender Jaguar is a famous example of such a guitar.
All bridges have advantages, depending on the playing style, but, in general, a non-tremolo bridge is thought to provide better tuning stability and a solid contact between the guitar body and the strings.