Accentuation refers to the emphasis placed on certain syllables or words within speech or writing. This emphasis can change the meaning of a sentence or highlight important information. In linguistics, accentuation is crucial for understanding the rhythm and melody of a language, as it helps convey emotions and intentions. In written language, accentuation often involves the use of diacritical marks, such as acute accents or grave accents, to indicate how a word should be pronounced. Different languages have their own rules for accentuation, which can affect both pronunciation and meaning, making it an essential aspect of language learning and communication.