An encyclopedia is a comprehensive reference work that provides information on a wide range of subjects. It is organized alphabetically and contains articles that summarize knowledge in various fields, such as science, history, and art. Encyclopedias can be found in print or digital formats, making them accessible to a broad audience. These resources are valuable for research and learning, as they offer reliable information compiled by experts. Popular examples include Encyclopædia Britannica and Wikipedia. Encyclopedias serve as a starting point for deeper exploration of topics and help users gain a general understanding of complex subjects.