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Part of linguistic competence involves the ability to construct and interpret words. The average high school student knows about 60,000 words whose form and meaning are not derived from those of other words. Such words including read, language, on, cold, and if, to name but a few - must be learned and stored as separate items in the lexicon (or mental dictionary). However, countless other words can be constructed and comprehended by the application of quite general rules to more basic words. For example, any speaker of English who knows the meaning of the noun fax - and the verb derived from it - could form and interpret words such as faxable (for things that can be faxed) and fax machine (for the device that sends and receives faxes). The system of categories and rules involved in word formation and interpretation is called morphology. This chapter presents an introduction to the study of morphology, beginning with the inventory of notions relevant to the analysis of word structure.