The Anglican Service Book is a book that helps people who are part of the Anglican Church (a type of Christian Church) to understand the right way to worship and pray together. It contains all the special words, prayers, and songs that the church uses during its services, like when people go to church on Sundays. Just like in school when you have a textbook to help you learn, this book helps Anglicans know what they're supposed to say and do during services. It also has instructions on how to do things like baptisms, weddings, and funerals. It's like a big guidebook that helps everyone in the church stay on the same page and worship together in the same way.