The Legacy Archive for Microwave Background Data Analysis (LAMBDA) was established in 2002 and in 2008 was made part of NASA's High Energy Astrophysics Science Archive Research Center (HEASARC). LAMBDA provides a resource for cosmology researchers, hosting data products from cosmic microwave background (CMB) measurements, Galactic and extragalactic astrophysical microwave observations, and line intensity mapping (LIM) experiments, in addition to a range of software tools, and educational material.