Answer:
In linguistics, an affix is a morpheme that is attached to a word stem to form a new word or word form. Affixes may be derivational, like English -ness and pre-, or inflectional, like English plural -s and past tense -ed. They are bound morphemes by definition; prefixes and suffixes may be separable affixes.
Ex.: incapable (The affix is the prefix in.) ex-President (The affix is the prefix ex-.) laughing (The affix is the suffix -ing.)
