This document provides an introduction to idioms and metaphors. It discusses how idioms are fixed expressions that use language metaphorically rather than literally. Common examples of idioms are provided. It also explains that metaphors are comparisons between two unlike things that help understand one idea in terms of another. Some key metaphors discussed are time is money, business is war, and life is a journey. The document emphasizes that idioms and metaphors are very important aspects of the English language.