Milk is an essential food of high biological value. The global demand for milk and dairy products continues to rise, while the resources available for animal rearing remain limited. Conventional methods of breeding, feeding, and management have improved milk production but are now reaching a plateau. Biotechnology provides modern scientific tools that help to increase milk yield, improve quality, and ensure sustainability in dairy farming. Advances in molecular genetics, genomics, and reproductive biology have transformed dairy science. Marker-assisted selection, genomic selection, and genome editing techniques such as CRISPR/Cas9 allow precise improvement of traits related to milk yield, composition, and disease resistance. Reproductive biotechnologies, including artificial insemination, embryo transfer, in vitro fertilization, and sexed semen, enable rapid multiplication of superior germplasm. Nutritional biotechnology focuses on nutrigenomics, probiotics, and enzyme supplementation to enhance nutrient utilization and reduce methane emissions. Molecular and hormonal interventions such as recombinant bovine somatotropin (rBST), growth hormone-releasing factors, and oxytocin analogs further support efficient milk synthesis. Recent innovations in mammary gland biology, stem cell research, and omics-based tools have deepened the understanding of lactation control. Digital technologies such as biosensors, precision dairy systems, and artificial intelligence now integrate biotechnological data into farm management. These approaches together improve productivity, animal health, and economic returns. Although biotechnology offers great promise, it must be used with care to address bioethical, environmental, and welfare concerns.