The Moon is a rocky airless body with much lighter gravity than Earth (about a sixth). It is a similar age to the Earth. The Earth has 81 times the mass of the moon.
The Moon is about 240,000 miles from the Earth, or about 30 times the Earth's diameter away. The Moon's diameter is a bit over 2000 miles.
The Earth and Moon revolvle about the their common center of gravity, which is inside the Earth, but not at it's center.