A "digital library of exemplary resource collections and services, organized in support of science education at all levels" maintained by the National Science Foundation. The "NSF expects the NSDL to become, over-time, the world's largest digital library of STEM (science, technology, engineering and mathematics) information resources and services as well as an online network of learning environments and resources for science, technology, engineering, and mathematics education at all levels."

"The National Science Foundation (NSF), through its Division of Undergraduate Education, is funding the development of the National Science Digital Library (NSDL) over the next 5 years."