This document discusses language, dialects, and registers. It begins by defining the difference between a language and dialect, noting that a dialect is a regional variety of a larger language. It then discusses two types of dialects: geographical/regional dialects, which vary based on geographic location; and social dialects, also called sociolects, which vary based to social factors like occupation, age, or class. Finally, it defines language registers as levels of formality, outlining five main registers from frozen to intimate and factors like audience and purpose that influence register choice.