This document discusses molecular markers and their applications in plant breeding. It defines molecular markers as DNA-based markers that are polymorphic, independent of environmental factors, and easy to use. The document outlines two main types of molecular marker techniques: hybridization-based methods like RFLP and PCR-based methods like RAPD and AFLP. It also discusses how molecular markers can be used for marker-assisted selection, genetic diversity analysis, genetic mapping, and authentication or fingerprinting in plant breeding programs.