The Moon is not a planet, but a luminary, a celestial body in the sky, which exerts a strong influence on the person.
The Moon represents the emotions, instinct, and the various phases of a person's moods and feelings.
The Moon rules the outer personality, it is opposite to the Sun, which shows the person's individuality.
The Moon shows how a person interacts with their surroundings and other people. The Moon shows how a person reacts instinctively before they have a chance to think.
Where the Moon is placed in a person's chart shows where a person will feel their emotional highs and lows.
Basically the Moon represents: