The drivers are the actual speakers of an earphone. This is the component that converts the electrical signals as sound and it helps you listen to it. The type and quality of a driver determine the sound quality too. There are many types of drivers available for the earphone. However, the types are categorized based on the sound quality. At the same time, there is no much of a difference in the quality of sound, but establishes a difference in the type of music and noise isolation.