This document discusses how to teach vocabulary in English language courses. It defines vocabulary as the words taught in a foreign language. There were historically low priorities placed on vocabulary teaching, but interest grew in the late 20th century with computer research on word patterns. Vocabulary can be taught explicitly through activities focusing on words, or implicitly through extensive reading. Key aspects in teaching vocabulary include denotative and connotative meanings, as well as horizontal and vertical relationships between words. Effective learning strategies include guessing meanings from context, using mnemonic devices, and maintaining vocabulary notebooks.