A glossary is a list of terms and their definitions, often found at the end of a book or document. It helps readers understand specific words or phrases that may be unfamiliar. For example, in a science textbook, a glossary might explain terms like photosynthesis or ecosystem, making the content more accessible. Glossaries are useful in various fields, including medicine, law, and technology. They serve as quick reference tools, allowing readers to grasp complex concepts without needing to search for definitions elsewhere. By providing clarity, glossaries enhance comprehension and improve the overall reading experience.