LIX, or LIX readability index, is a tool used to measure the readability of a text. It helps determine how easy or difficult a piece of writing is to understand. The index is calculated based on the number of words, sentences, and long words in a text, providing a score that indicates the level of education required to comprehend it. The LIX score ranges from low to high, with lower scores indicating easier texts, suitable for younger readers, while higher scores suggest more complex material. This tool is often used by educators, writers, and publishers to assess and improve the clarity of their content.