This lecture covers the living anionic polymerization of vinyl monomers, emphasizing the absence of termination reactions and the introduction of end groups by quenching reagents. It explains the living nature of the polymerization, molecular weight control, Poisson distribution of molar mass, and the synthesis of block copolymers. Additionally, it discusses thermoplastic elastomers from BAB triblock copolymers and compares chain-growth and step-growth polymerizations. The lecture concludes by mentioning various polymerization mechanisms like ATRP, RAFT, SFRP, and living radical polymerization.