This document discusses root words, prefixes, and suffixes. It explains that root words are the basic words that can have prefixes added to the beginning or suffixes added to the end to change the meaning. Prefixes and suffixes are groups of letters that are added to root words. Common prefixes discussed include "un", "mis", "sub", and "pre", along with their meanings. Examples are given of how prefixes change the meaning of words. Suffixes are also explained as changing the meaning when added to the end of words. Some common suffixes and their meanings are outlined such as "-s", "-ing", "-er", and "-ful".