Plant biotechnology is a branch of biotechnology that uses scientific techniques to improve plants for human benefit. It involves methods like tissue culture, genetic engineering, molecular markers, and plant breeding to develop plants with desirable traits such as higher yield, disease resistance, drought tolerance, and enhanced nutritional value. Plant biotechnology also helps in producing valuable products like vaccines, enzymes, and secondary metabolites from plants, while supporting sustainable agriculture by reducing the need for chemical fertilizers and pesticides. It plays a major role in food security, environmental protection, and the development of stress-tolerant crop varieties.