iLumina is a digital library of sharable undergraduate teaching materials for chemistry, biology, physics, mathematics, and computer science. It is designed to quickly and accurately connect users with the educational resources they need. These resources range in type from highly granular objects such as individual images and video clips to entire courses. Resources in iLumina are cataloged in the MARC and NSDL metadata formats, which capture both technical and education-specific information about each resource. iLumina contains thousands of educational resources and several virtual collections. Please feel free to contribute your own resources to iLumina by following the contribute link in the header.