The aim of the present book is to examine the social and cultural diversity of language teacher education, providing a unified account of highly diversified teacher development and appraisal realities across sociocultural contexts. We will strive to make an overview of a wide range of issues related to teacher development approaches and models, teacher competences, adopted roles, stressors and motivators, teacher appraisal systems, professional examinations and certifications as well as digital opportunities for teacher development. All of these concepts will be discussed in a wide social and cultural context, trying to bring examples from numerous countries.