An astrologer is a person who studies and practices astrology, which is the belief that the movements and relative positions of celestial bodies can provide information about human affairs and natural phenomena. In Hindi, an astrologer is called a "jyotishi" or "graha jyoti." They use various tools such as horoscopes and birth charts to analyze and make predictions about a person's life and future. They may also provide advice on aspects such as career, relationships, and financial matters.