The zodiac is a circle of twelve signs, each representing a different character or animal. The twelve signs are: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. These signs are based on the ancient Greek constellations, which were named after various mythological creatures. The zodiac has become an essential part of astrology, as it is used to determine an individual's personality, strengths, and weaknesses based on their birth sign.