Prove that K^n satisfies axioms of vector spaces

Let K be a field and n greater than or equal to 0. Prove that K^n satisfies the following axioms of vector spaces:

1) (a + b) + c = a + (b + c)

2) There is a number 0 in S such that a + 0 = 0 + a = a for all a in S.

I don't understand what to do as I don't really understand what K^n is and how I'd go about proving these statements.

Thanks.