Foreign language anxiety is the psychological tension, apprehension, and worry experienced by non-native speakers when learning or using a foreign language (Young, 1991). Such a phenomenon can make English learning a traumatic experience for learners and may prevent them from learning it effectively. In this respect, this book aims at introducing a critical review of the literature about this psychological variable, its types, factors, symptoms, and negative effects. Through two research methods, which are the scale and the questionnaire, this book also has the purpose of investigating Foreign Language Anxiety among Moroccan secondary and high school students. Not only that, but this book also attempts to suggest a variety of strategies to alleviate anxiety among learners in order to make their EFL learning experience an interesting and pleasing one. Therefore, this book can be useful for students, teachers, parents, educational counselors, curriculum developers, educational policy makers, and researchers.