To simplify \( 5^{10} \times 5^{5} \) using the Product Rule of Exponents, you add the exponents of the same base together. The Product Rule states that:
\[ a^m \times a^n = a^{m+n} \]
In your case, the base \( a \) is 5, \( m \) is 10, and \( n \) is 5. Therefore:
\[ 5^{10} \times 5^{5} = 5^{10+5} = 5^{15} \]
Thus, the simplified result is:
\[ 5^{15} \]