To simplify \( \frac{2}{\sqrt{14}} \) and rationalize the denominator, we can multiply both the numerator and the denominator by \( \sqrt{14} \):
\[ \frac{2}{\sqrt{14}} \cdot \frac{\sqrt{14}}{\sqrt{14}} = \frac{2 \cdot \sqrt{14}}{\sqrt{14} \cdot \sqrt{14}} = \frac{2\sqrt{14}}{14} \]
Next, we can simplify \( \frac{2\sqrt{14}}{14} \):
\[ \frac{2\sqrt{14}}{14} = \frac{\sqrt{14}}{7} \]
Thus, the final answer is:
\[ \frac{\sqrt{14}}{7} \]