The article discusses the book "Informal digital learning of English: Research to practice" by J.S. Lee. The book explores the phenomenon of informal digital learning of English, where learners engage in self-directed activities outside of the formal classroom setting. Lee highlights the relationship between informal digital learning and language learning outcomes and provides pedagogical recommendations for English teachers. The book covers various topics, including the history of technology in language learning, the concept of Language Beyond the Classroom (LBC), the advantages of informal digital learning activities, and strategies for integrating informal digital learning into formal classroom contexts. The article suggests that teachers should consider the benefits of informal digital learning and encourage learners to engage in these activities outside of class. [Extracted from the article]