Reading level refers to the complexity of a text, indicating how difficult it is for a reader to understand. It is often determined by factors such as vocabulary, sentence structure, and the themes presented. Tools like the Flesch-Kincaid Grade Level and Lexile Measure help assess reading levels, making it easier for educators and parents to match books to a reader's abilities. Different reading levels cater to various age groups and skill sets. For example, children's books typically have simpler language and shorter sentences, while academic texts may use advanced vocabulary and complex ideas. Understanding reading levels can enhance literacy development and promote a love for reading.