Suppletion is a linguistic phenomenon where an irregular morphological change occurs in a word, often involving the use of entirely different roots to express different grammatical forms. For example, in English, the past tense of the verb "go" is "went," which does not share any phonetic similarity with its base form. This contrasts with regular verbs, where the past tense is typically formed by adding a suffix. This process can be observed in various languages and is often a result of historical language change. Suppletion highlights the complexity of language evolution, as it reflects how words can transform over time while maintaining their meanings. Examples can be found in languages like Latin and Spanish, where similar irregularities exist.