This document provides definitions and explanations of key terms related to language acquisition and teaching approaches. It discusses concepts such as the difference between acquisition and learning, digital literacy vs traditional literacy, English as a foreign language vs English as a second language, the language acquisition device, multiple intelligences theory, phonics, the silent period, total physical response teaching, target language, mother tongue, the critical period, and the zone of proximal development. A variety of online resources on these topics are also listed.