What is an affix? (Linguistics)

Definition
	An affix is a bound morpheme that is joined before, after, or within a root or stem.

Discussion
	An affix is joined by derivation or inflection.

Kinds
	Here are some kinds of affixes:
	What is an infix? What is a prefix? What is a suffix? What is a circumfix? What is a simulfix? What is a suprafix? What is a separable affix? What is a derivational affix? What is an inflectional affix?

Comparison of kinds of affixes
	Here is a table showing some kinds of affixes with examples:
	Affix Relationship to root or stem Example prefix Occurs in the front of a root or stem unhappy suffix Occurs at the end of a root or stem happiness infix Occurs inside of a root or stem bumili 'buy' (Tagalog, Philippines) circumfix Occurs in two parts on both outer edges of a root or stem kabaddangan 'help' (Tuwali Ifugao, Philippines) simulfix Replaces one or more phonemes in the root or stem man + plural > men suprafix Superimposed on one or more syllables in the root or stem as a suprasegmental stress in the words 'produce, n. and pro'duce, v.

Generic
	An affix is a kind of
	What is a morpheme type?