This document discusses the Indonesian language prefix "ber-". It begins by defining affixes as linguistic elements added to words to change their meaning. There are four types of affixes in Indonesian: prefixes, infixes, suffixes, and confixes. The document then focuses specifically on the prefix "ber-". It notes that "ber-" forms intransitive verbs or adjectives in Indonesian. The form of "ber-" may change depending on the initial sound of the word it is added to. Finally, the document outlines 11 meanings that the prefix "ber-" can indicate when added to different parts of speech, such as expressing actions, possession, or experiencing a feeling.