What are the moons of Mars believed to be?

The moons of Mars, Phobos and Deimos, are believed to be captured asteroids from the asteroid belt. Their irregular shapes and small sizes suggest that they are not formed from the same processes as larger moons, indicating a different origin. Both moons are composed of carbon-rich rock and ice, supporting the theory of their asteroid-like nature. Their orbits and surface characteristics align with those of other small celestial bodies in the solar system.