Drug delivery refers to the method and process of administering a pharmaceutical compound to achieve a therapeutic effect in patients. This can involve various routes, such as oral, intravenous, or topical, depending on the drug's properties and the desired effect. Effective drug delivery systems ensure that the right dose reaches the target area in the body at the right time. Advancements in drug delivery technologies aim to improve the efficacy and safety of medications. Techniques like nanoparticles, liposomes, and microneedles are being developed to enhance absorption and minimize side effects. These innovations help in treating various conditions more effectively, including cancer and chronic diseases.