Chemical databases are organized collections of chemical information that provide data on various substances, including their structures, properties, and reactions. These databases are essential for researchers, chemists, and students, as they facilitate the search for specific compounds and help in understanding chemical behavior. Examples of popular chemical databases include PubChem, ChemSpider, and Reaxys. These databases often include features like search functions, visualization tools, and links to scientific literature. They can contain information on molecular weights, boiling points, and safety data, making them valuable resources for both academic and industrial applications in the field of chemistry.