Electric guitars are a type of guitar that relies on the use of an amplifier to produce sound. They typically have six strings and can be played with either fingers or a plectrum, which is more commonly known as the "pick". The electric guitar has since become one of the most well-known instruments in popular music around the world. They're usually made from different types of metal like aluminum and steel, which makes them heavier than acoustic guitars so it's easier for them to withstand years of heavy playing without cracking or breaking.