The bass guitar is a stringed instrument played primarily with the fingers or thumb, by plucking, slapping, popping, tapping, thumping, or picking with a plectrum, often known as a pick.
The bass guitar is similar in appearance and construction to an electric guitar, but with a longer neck and scale length, and four to six strings or courses. The four-string bass?by far the most common?is usually tuned the same as the double bass, which corresponds to pitches one octave lower than the four lowes...
Read more: Wikipedia