This volume presents research on second language learning through audiovisual input, conducted within the SUBTiLL (Subtitles in Language Learning) project at the University of Barcelona. It includes studies exploring various language dimensions and skills, such as vocabulary, pronunciation, and reading, while also considering learner factors, such as language learning aptitude and proficiency. Two distinctive features of this collective volume are 1) the inclusion of children and teenagers as participants in studies, addressing the gap concerning young learners in this line of research, and 2) an emphasis on longitudinal studies, enhancing the ecological validity of the findings. The studies in this volume also showcase a diverse range of research instruments, from eye-tracking to retrospective interviews, enriching our comprehension of this innovative research area. A concluding chapter synthesizes these findings, linking them to prior research and advancing our understanding of the role of audiovisual input in language acquisition.