To simplify the expression \( 7^5 \cdot 7^2 \) using the Product Rule of Exponents, we can apply the rule which states that when multiplying two expressions with the same base, you add their exponents.
Thus, we have:
\[ 7^5 \cdot 7^2 = 7^{5+2} = 7^7 \]
So, the simplified expression is \( 7^7 \).