Molecular biology is a branch of biology that focuses on the study of biological processes at the molecular level, particularly the interactions between various types of biological molecules such as DNA, RNA, proteins, and other molecules involved in cellular processes. This field encompasses a wide range of topics, including molecular genetics, gene expression, DNA replication and repair, protein synthesis, and regulation of cellular processes. Molecular biologists use a variety of techniques and approaches, such as genetic engineering, recombinant DNA technology, and bioinformatics, to study and manipulate biological molecules in order to understand how they function and interact with one another. The insights gained from molecular biology research have led to significant advancements in our understanding of genetics, cell biology, biochemistry, and many other fields of biology.