Synastry is a branch of astrology that examines the relationship between two individuals by comparing their natal charts. It focuses on how the planets and signs in each person's chart interact with one another, revealing potential strengths and challenges in their relationship. By analyzing aspects such as Sun, Moon, and Venus placements, astrologers can gain insights into emotional compatibility, communication styles, and shared values. This practice helps individuals understand their dynamics better, fostering personal growth and deeper connections.