Punctuation is a research area within linguistics that focuses on the use of symbols and marks, such as commas, periods, and question marks, in written language. Researchers in this field study how punctuation is used to convey meaning, structure sentences, and clarify the intended message of a text. They also investigate the evolving conventions and practices of punctuation across different languages and cultures. Additionally, research in punctuation may explore how punctuation affects readability, comprehension, and interpretation of written texts.