How is sound heard or processed through the ear?

You got two ears. Usually the sound comes as pressure waves from outside the head, goes through the ear canal and hit one ear drum at an earlier time than the other and with a louder level than the other. You use that to decide the direction of the sound source. Also the concha is helpful to differentiate between front and rear. How the sound at the moving ear drum is converted to nerve pulses to reach your brain is very complicated and yet not full understood.