This lecture discusses transition metal polymers. Transition metal polymers contain transition metal complexes in their side chains or main chains. They are synthesized via various methods including radical polymerization, cationic polymerization, condensation polymerization, and ring opening polymerization. Transition metal polymers exhibit properties such as magnetism, photosensitivity, thermal stability, and conductivity due to the presence of transition metals. They have applications as sensors, catalysts, and conductive materials.