The bass guitar is a stringed instrument played primarily with the fingers or thumb, by plucking, slapping, popping, strumming, tapping, thumping, or picking. 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. Bass guitar is different from their highly stringed cousins(normal guitar) in many ways. Bass guitar traditionally have four strings while a normal standard guitar has six strings. The bass guitar has a longer neck and a longer string with pitch than than the normal guitar. Normally bass guitars are electric but acoustic bass guitars are also available in the market. 

Bass guitar lock in with (especially) the bass drum and help link the main beat, the main pulse, of the music from the ‘dry’ sound of the drum to the ‘warmer’ sound of the harmony and melody content of the music.

Ever seen someone soloing on a 24 string bass guitar? No? Well, here is a video where Davie504 solos on a 24 stringed guitar. Have a look at the video here: