This document discusses prefixes and suffixes in English. It defines a prefix as a letter or word added to the beginning of a word to modify its meaning. A suffix is defined as an affix added to the end of a word. Some examples of common English suffixes are those indicating plural, past tense, and comparative forms. Suffixes can be either inflectional, carrying grammatical information, or derivational, changing the lexical category or meaning of a word. Common English derivational suffixes discussed include -ly, -ish, -able, and -ness.