This book provides a survey of issues and studies on ‘applied’ corpus linguistics across two crucial decades, 2000-2020, which have marked enormous advancements in the field of corpora studies. At present, corpus linguistics and its applications form a well-established field of research which deserves special attention by English as a Foreign Language (EFL) students and practitioners actively engaged in the study of the English language across the ‘three circles’. The original core of this volume drew on EFL data, and later progressed to include specific topics concerning English as a Second Language (ESL), as well as a first/native language. Such analyses are reported in the second part of the volume as individual replicable case studies investigating data from Italian learners of English at various academic levels, from Indian speakers of English as a second language, and from native speakers of English in Canada.