What is a Singer/Songwriter?

According to Wikipedia, singer-songwriter is a term that refers to performers who write, compose and sing their own material including lyrics and melodies.

They often provide the sole accompaniment to an entire composition or song, typically using a guitar. The term is also sometimes used for a genre of music that is often performed in this manner. A number of other well-known musicians may write some of their own songs, but are usually referred to as singers instead.