Preschool helps children socialize and interact with other children and adults, preparing them for school. A study found that children who attended preschool were more likely to succeed in school, graduate from high school, and attend college. The document provides tips for parents on determining if a child is ready for preschool based on their ability to socialize and separate from parents, researching preschool programs, building anticipation rather than anxiety, and helping children learn to say goodbye.