To simplify \(\sqrt{18}\), we start by factoring \(18\) into its prime factors.
\[ 18 = 9 \times 2 \]
Next, we note that \(9\) is a perfect square (\(3^2\)). We can rewrite the square root as follows:
\[ \sqrt{18} = \sqrt{9 \times 2} \]
Applying the property of square roots \(\sqrt{a \times b} = \sqrt{a} \times \sqrt{b}\), we have:
\[ \sqrt{18} = \sqrt{9} \times \sqrt{2} \]
Since \(\sqrt{9} = 3\), we can simplify further:
\[ \sqrt{18} = 3 \times \sqrt{2} \]
Thus, the final simplified form of \(\sqrt{18}\) is:
\[ \boxed{3\sqrt{2}} \]