Line spacing refers to the vertical distance between lines of text in a document. It is an important aspect of formatting that affects readability and overall appearance. Common line spacing options include single spacing, 1.5 spacing, and double spacing, each providing a different amount of space between lines. Adjusting line spacing can help improve clarity, especially in longer texts. For instance, using double spacing is often required in academic papers to make it easier for readers to annotate and review the content. Proper line spacing contributes to a more organized and visually appealing layout.