 Research activities in the field of diketopyrolopyrrol, DPP, based polymers are reviewed. Synthetic pathways to monomers and polymers, and the characteristic properties of the polymers are described. Potential applications in the field of organic electronic materials such as light-emitting diodes, organic solar cells and organic field effect transistors are discussed. This article was authored by Baron Teak, a Raman Rabindranath, Kai Zhang and others.