Since most people here seem to be ignorant of what a bass is:
1) It was NOT "based off the guitar", it's an electric adaptation of the double bass which became awkward and increasingly less audible compared to other instruments in the earliest rock/jazz bands.
2) While easier to learn than guitar, it is far far more difficult to master. Anyone can sound cool playing the pentatonic scale and power chords over and over; it takes a great more deal of musical skill and talent to be excellent at bass.
3) On a related note "Anyone who plays guitar can play bass by default" is ridiculous. If you have no sense of rhythm and can't keep a beat, then you can't play bass. Hell, most guitarists I've met can't even play the bass without making the frets buzz their first few times.
4) Bass is a rhythm instrument, with a deeper more mellow sound. Guitar is melodic (or at least mostly used for such). To say bass is inferior to guitar is also stupid.
2) A guitarist can sound "amazing" in just a couple years. I'd like to see anyone learn Victor Wooten's Classical Thump in just a couple of years.
3) "Whoa dude whats wrong with your frets? Why are they buzzing??" - Guitarist who thinks he can play bass
4) Have you ever heard a band with two guitarists and no bassist? It sounds like a transistor radio
goes great with drums
Like the original upright bass, bass guitars most commonly have 4 thick strings tuned EADG. But extended-range models with five (BEADG) or six strings (BEADGC) are available too, as are 8 and 12 string models (based off the idea of 12 string guitars).
many people overlook the bass as being simple but if anyone has any proper knowledge of the bass then they know that it is harder than it looks to play.
people may say if u can play guitar u can play bass but its not always like that. due to the basses heaviness and longer neck it can take a while to get used to!