Lexile measures are a standardized way to assess the reading ability of individuals and the difficulty of texts. They are expressed as a number followed by an "L" (e.g., 850L), indicating the level of reading comprehension a person has or the complexity of a book. This system helps educators match students with appropriate reading materials to enhance their learning. The Lexile Framework considers factors like vocabulary and sentence length to determine a text's complexity. By using Lexile measures, teachers can better support students in developing their reading skills and ensure they are challenged without becoming frustrated.