The image I get from reading the popular literature is that, according to string theory, there is a one to one relationship between strings and particles. Another way of saying this is that there are exactly as many strings in the universe as there are particles. The way that the string vibrates determines which species of particle the string is related to. String A vibrates as a proton, while string B vibrates as an electron, etc. Is this too naive? If so, what is the correct view?