Deimos and Phobos
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Phobos can be seen in this picture taken by the Mars Global Surveyor in 2003.
Deimos can be seen in this picture taken by the Mars Reconnaissance Orbiter in 2009.
Credit: NASA/JPL-Caltech/University of Arizona
Mars has two moons: Deimos and Phobos. Both are small, lumpy and are shaped like asteroids. Scientists think they are made of carbon rich rock and ice. Phobos is the bigger of the two moons and is about 27 km (17 mi) in diameter at it's widest. Phobos orbits Mars 3 times a day and is spiraling 6ft closer to mars every 100 years scientists predict that it will either crash into mars or break up into a ring around Mars.
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Deimos is the smaller of the two moons and is about 14.5 km (9 mi) at it's widest. It takes Deimos 30 hours for it to orbit Mars. Deimos also has a thick regolith formed by meteors that have pulverized the surface. NASA has sent many orbiters to view Mars which also studied its moons. Scientists have discussed the possibility of using one of the moons as a base to send robots to mars surface.
This video by Kurzgesagt explains Phobos and Deimos very well.