An electric guitar is a type of guitar that uses pickups to convert the vibration of its steel-cored strings into electrical current. The revolutionary technology today is simply a modification of the tools used in music's recent past. The signal may be electrically altered to achieve various tonal effects prior to being fed into an amplifier, which produces the final sound which can be either an electrical sound or an acoustic sound. Distortion, wah, equalization, tremolo, and phasers, amongst others, can change the sound that is emitted from the amplifier.
The electric guitar is used in many popular styles of music, including almost all genres of rock and roll, country music, jazz, blues, and even contemporary classical music. Its distinctive sound and intimate association with many legendary internationally-famous musicians has made it the signature instrument of late twentieth-century music. Specialized steel guitars, although they are also electric instruments descended from the guitar, are normally not considered electric guitars but rather as a separate instrument. This distinction has important consequences on claims of priority in the history of the electric guitar.