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Planets orbit the Sun while moons orbit around planets. The amount of time required for a planet or moon to complete one orbit around another body is called an orbital period. On Earth, we call this orbital period a year. Our year is 365.256 days. On Mars it takes 686.98 days (Earth days, that is) to complete one orbit about the Sun--that's a long time to wait between birthdays!
It takes 88 Earth days for Mercury to complete an orbit of the Sun, about 1/4 of an Earth year. The day on Mercury is unusual. The planet's spin is extremely slow, taking about 58.7 Earth days to make one rotation. This is exactly 1.5 turns for each orbit. The result of these two periods is that the solar day is greatly extended, and lasts about 176 Earth days (sunrise to sunrise).