An astrological sign is a special group that a person belongs to based on when they were born. It's like there are 12 groups, and which one you belong to depends on the month and day you were born. Each group has its own special name, like Aries or Sagittarius.
People think that your astrological sign can affect your personality or your life. They believe that the way the stars and planets were aligned when you were born can affect how you behave, how you feel, and even what kind of things will happen to you.
For example, if you were born in May, you are in the Taurus group. People who belong to Taurus are said to be strong and determined, and they like to take their time with things. If you were born in November, you are in the Scorpio group, and people who belong to Scorpio are said to be intense and passionate.
Some people really believe in astrology and think that it can tell them a lot about themselves and their future. Others think it's just for fun and that it's not really based on anything real or scientific. Either way, knowing your astrological sign can be a fun way to learn more about yourself and the people around you!