What is seed value

Answer 1

With a different seed you get different random numbers. So you want to give it a unique value. For small applications, you just make the seed time(0) from <ctime>. That is the current amount of seconds after 1970.
Btw for random number generation, you should use the modern <random> header instead of the old rand().

Answer 2

seed value used to initialize a pseudorandom number generator