a seed is a number you start from as many random number generators are not random at all.
They start with a number (the 'seed') then they apply a calculation to it to get the second random number, then the same calulation is applied to the second number to achieve the third and so on.
so a seed is a number you start from.
Spammers next time you spam me consider the implications:
(1) that you will be persuaded by me(in a legitimate mannor)
(2)It is worthless to you, when i have finished