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Why does Titan keep the same face toward Saturn?

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Titan Titan, moon of Saturn, photographed by Voyager 2 on August 25, 1981, at a distance of 907,000 km (564,000 miles). Green and violet images were combined to make this photograph, which shows the extended atmosphere of the satellite.

Titan keeps the same face toward Saturn because it is in a state of synchronous rotation.1

This phenomenon occurs due to tidal interactions between Saturn and its moons. Over time, the gravitational attraction between the two bodies causes cyclic deformations that act to brake the moon's spin, eventually locking its rotation period to match its orbital period. Once a moon reaches this state, it always keeps the same hemisphere facing its planet. This is a common occurrence in the solar system, observed with Earth's Moon and several other moons of Saturn and Jupiter.1