Quandl is a platform that provides financial, economic, and alternative datasets for investment professionals, financial institutions, and corporate clients. It offers over 20 million data series from more than 700 sources, encompassing data on stock prices, commodities, indices, and more. The platform is known for delivering data in a user-friendly format, making it easy to integrate with various analytical tools and software applications. Quandl also emphasizes transparency and reliability in its data offerings, catering to the needs of analysts and researchers who require accurate and timely information.