Use the zero or negative exponent rule to simplify the expression. \[ 7^{-2} \] \[ 7^{-2}= \] (Type an integer or a simplified fraction.)

Step 1 ：Rewrite the expression \(7^{-2}\) as \(\frac{1}{7^{2}}\) according to the negative exponent rule.

Step 2 ：Calculate the denominator \(7^{2}\) to get 49.

Step 3 ：So, the simplified form of \(7^{-2}\) is \(\frac{1}{49}\).

Step 4 ：\(\boxed{\frac{1}{49}}\) is the final answer.