This lecture covers the definitions of post-tensioning and pre-tensioning, the types of prestressing steel, tendons for post-tensioning, stressing of tendons, and post-tensioning anchorage. It also explains initial prestressing force, different types of prestressing, and the process of prestressing. The lecture delves into the concepts of eccentricity, stresses in center span, and alternatives in prestressing. Additionally, it discusses debonding in prestressing, prefabrication with post-tensioning, and post-tensioning anchorage methods.