Underlining is a text formatting technique used to emphasize specific words or phrases. It involves drawing a line beneath the text to make it stand out, often used in written documents, books, and academic papers. This method helps readers identify important information quickly. In digital contexts, underlining is commonly applied to hyperlinks, indicating that the text is clickable. While underlining can enhance clarity, it is essential to use it sparingly to avoid cluttering the text. Alternatives like bold or italic formatting can also be effective for emphasis without overwhelming the reader.