CliffNotes are study guides that provide summaries and analyses of literary works, helping students understand key themes, characters, and plot points. They are designed to simplify complex texts, making it easier for readers to grasp essential information without reading the entire work. Originally created in the 1950s, CliffNotes have expanded to cover a wide range of subjects, including literature, history, and science. These guides are often used by students for exam preparation or to enhance their comprehension of challenging material, serving as a valuable resource for academic success.