Guitar effects are electronic devices that modify the sound of an electric guitar. They can enhance or alter the tone, adding depth and character to the music. Common types of effects include distortion, reverb, and delay, each creating unique sounds that can range from subtle to dramatic. These effects can be used individually or combined in a pedalboard setup, allowing guitarists to create a wide variety of sounds. Many musicians use effects to express their creativity and develop their signature sound, making them an essential part of modern guitar playing.