Applied linguistics is an interdisciplinary field of linguistics which identifies, investigates, and offers solutions to language-related real-life problems. Some of the academic fields related to applied linguistics are education, psychology, communication research, anthropology, and sociology.
English usually refers to:
English is a West Germanic language that was first spoken in early medieval England and is now a global lingua franca. Named after the Angles, one of the Germanic tribes that migrated to England, it ultimately derives its name from the Anglia (Angeln) peninsula in the Baltic Sea. It is closely related to the Frisian languages, but its vocabulary has been significantly influenced by other Germanic languages, particularly Norse (a North Germanic language), as well as by Latin and French.
Language is a system that consists of the development, acquisition, maintenance and use of complex systems of communication, particularly the human ability to do so; and a language is any specific example of such a system.
Linguistics is the scientific study of language, and involves an analysis of language form, language meaning, and language in context. The earliest activities in the documentation and description of language have been attributed to the 6th century BC Indian grammarian Pāṇini, who wrote a formal description of the Sanskrit language in his Aṣṭādhyāyī.
No jobs, no people. No people, no Gaeltacht. No Gaeltacht, no language.
Attributed to Tom O'Donnell 
The limits of my language mean the limits of my world.
Ludwig Wittgenstein Tractatus Logico-Philosophicus (5.6)
Well languag'd Danyel.
William Browne, Britannia's Pastorals, Book II. Song 2, line 303.