This document discusses formality and register in language. It explains that language varies depending on factors like topic, relationship between speakers, and whether the language is written or spoken. When analyzing differences in formality/register, one looks at vocabulary choices, sentence complexity, pronunciation, and contractions. Register is important to consider when analyzing texts and when writing one's own texts. The document provides examples of levels of formality from formal to informal and sample text types where each level may be used. It prompts analyzing the formality of sample texts and comparing their levels of formality.