The Baby-Sitters Club is a popular book series created by Ann M. Martin that follows a group of young girls who start a babysitting business. The series features characters like Kristy Thomas, Mary Anne Spier, Claudia Kishi, and Stacey McGill, each with their own unique personality and background. The stories explore their friendships, challenges, and adventures as they manage their babysitting jobs and navigate middle school life. The first book was published in 1986, and the series has since expanded to include over 200 titles, graphic novels, and a television adaptation. The Baby-Sitters Club has been praised for its relatable characters and themes of friendship, responsibility, and growing up, making it a beloved choice for young readers.