ChemSpider is a free online chemical database that provides access to a vast collection of chemical information. It contains data on millions of chemical compounds, including their structures, properties, and related literature. Researchers and students can use ChemSpider to find detailed information about specific chemicals and their applications. The platform is maintained by the Royal Society of Chemistry and serves as a valuable resource for scientists in various fields, including chemistry, biology, and pharmacology. Users can search for compounds by name, structure, or other identifiers, making it a versatile tool for academic and industrial research.