The book "What is worship?" published under the authorship of Jarnefelt Arvid - a Finnish writer and activist in church life. In this book, the author explores the essence and meaning of worship in Christianity. He examines various aspects of church rites, rituals and traditions, revealing their spiritual and symbolic meaning for believers. The book is an interesting lecture for those interested in religious practice and spiritual development. Yarnefelt uses accessible language and concrete examples to help readers better understand the essence of worship and its role in religious life.