The document discusses the Indonesian prefix "pe-". It begins by defining affixes and listing the main types: prefix, infix, suffix, confix, and reduplication. It then focuses on explaining the prefix "pe-": its form and variations depending on the basic word attached, its functions of forming nouns and describing professions/habits, and examples like "pelaut" (sailor). Pseudo prefixes that appear to start with "pe-" but are actually from other languages or reduplication are also noted. Finally, examples demonstrate how "pe-" attaches to different parts of speech.