Understanding Biology by Raven and Johnson is a comprehensive textbook that introduces students to the subject of biology. Cell structure and function, genetics, evolution, ecology, and other topics are covered in the textbook. To assist students to comprehend the topics, it includes clear and short explanations, numerous pictures and diagrams, and real-world examples. Understanding Biology also offers interactive learning tools that aid with student retention and comprehension, such as online quizzes and self-assessment questions. The textbook is appropriate for students of all levels and serves as an excellent resource for both classroom and independent study.