Morphological processes involve the internal structure of words. There are two main types of morphological processes: [1] affixation, which involves adding prefixes or suffixes to free or bound morphemes, and [2] other word formations like compounding, reduplication, and clipping. Affixation can be inflectional, which changes word form without altering word class or meaning, or derivational, which alters word class or meaning. Some examples of morphological processes in English include adding -s for plural nouns, -ed for past tense verbs, and prefixes like un- or re- to change a word's meaning. Morphology is the study of these word formation rules and patterns.