This document discusses the history and definitions of Computer Assisted Language Learning (CALL). It describes CALL as using computers to aid in language teaching through presentation, reinforcement, and assessment of material, with an interactive element. The origins of CALL date back to the 1960s, starting with the PLATO project at the University of Illinois in 1960. Early CALL programs presented stimuli for learners to respond to via keyboard. More recent explorative CALL uses concordance programs and data-driven learning to allow learners to explore language patterns on their own.