Biologics are large, complex molecules derived from living cells, including monoclonal antibodies (mAbs), which specifically target disease-associated antigens. Monoclonal antibodies (mAbs) are utilized in the treatment of cancer, autoimmune diseases, and infectious diseases. They offer enhanced specificity and lower toxicity in comparison to small molecules. Development techniques such as hybridoma technology and recombinant DNA technology are employed in their production. Biologics are reshaping modern therapeutics.