Digital technology has become part of people's daily lives. Dealing with it in the school environment is a way of bringing the out-of-school environment closer to the in-school environment, as well as training citizens who are able to deal critically with new social technological practices. With this in mind, the book problematises teaching and learning in the field of digital technologies, a current issue experienced by teachers and students who are faced with the challenge of using digital artefacts in their contexts. Seeking to discuss this scenario, the book covers the following themes: Applied Linguistics, Teacher Training, the Teaching-Learning Process in Digital Contexts and Activity Theory.