The document discusses Reverse Time Migration (RTM) algorithms. It begins with an agenda that outlines key topics including the assumptions and mathematics behind RTM and applications of modern RTM migration. It then defines important terms and explains where RTM fits within other migration algorithms such as Kirchhoff migration and downward continuation migration. The core of RTM relies on three assumptions: the exploding reflector concept, solving the wave equation by marching backwards in time, and working in the frequency domain for efficiency. The document provides details on how the RTM algorithm is implemented using these assumptions to migrate seismic data from final time to reflection time.