PBS archives are stored according to program, subject and type of material. For example, entering Nova Archive, World War II archive, or Photograph Archive in the search box on PBS.org returns links to relevant archives. Simply click on the link to visit the archive.
To find recent programs that can be watched online for free, go to the video page on PBS.org. The video page also highlights programs whose free viewing is about to expire. Programs in the archives offer a description and transcripts, and some can be watched online for free. Programs that must be purchased usually offer at least video clips or transcripts.