Christmas Eve is the night before Christmas Day, and it is the most exciting night of the year for children all over the world. On Christmas Eve, Santa Claus and his reindeer come to visit children and leave gifts under the tree. It is also a time of celebration and anticipation as families gather together to enjoy the holiday. Children all around the world stay up late to wait for Santa's arrival, and they often leave cookies and milk out for him as a treat. It is a magical night, full of wonder and excitement.