This document discusses root words, base words, prefixes, and suffixes. It explains that root words and base words form the core of a word and prefixes and suffixes can be added to change the meaning. Many examples of common prefixes and suffixes are provided along with their meanings such as "un-" meaning "not" and "-able" meaning "able to." Roots from various languages are also explained, such as "chron" meaning "time" and "bio" meaning "life." The document serves as an introduction to word structures and origins.