To multiply the fractions \( \frac{5}{7} \) and \( \frac{5}{7} \), you multiply the numerators together and the denominators together:
\[ \frac{5}{7} \times \frac{5}{7} = \frac{5 \times 5}{7 \times 7} = \frac{25}{49} \]
So, \( \frac{5}{7} \times \frac{5}{7} = \frac{25}{49} \).