This document discusses root words, prefixes, and suffixes used to build other words. It provides examples of root words like "like" that can be modified with prefixes like "dis" to form "dislike" or suffixes like "ed" to form "liked." Prefixes are placed at the beginning of words and convey meanings like "not" or "with." Suffixes are placed at the end and convey meanings like "kill(ing)" or being "one who believes." The document encourages practicing identifying words containing root words like "geo," "grad," "jud," "like," "count," and "photo."