This insightful book explores the impact of internet-based technologies on second language acquisition, focusing on informal learning. It traces the evolution of informal learning, emphasizing the crucial role of input, interaction, and output in acquiring English as a second language. The book analyzes diverse out-of-school practices, such as watching TV, gaming, and social media engagement, and their impact on L2 development. Additionally, it delves into various intervening variables—age, gender, proficiency, engagement, and affective variables—highlighting the personalized nature of L2 acquisition. It also addresses the challenges encountered by L2 teachers, advocating innovative teaching methods to bridge the gap between classroom teaching and the real world. This book is an invaluable resource for enthusiasts interested in the intersection of language acquisition, teaching methodologies, and modern technologies.