Liposomes are spherical vesicles composed of lipid bilayers, widely used in drug delivery and biomedical research. They were first discovered in the 1960s and have since evolved into versatile carriers for therapeutic agents. Liposomes enhance drug stability, bioavailability, and targeted delivery, making them valuable in nanomedicine. Researchers continue to refine liposome formulations to improve treatment efficacy and reduce side effects in various medical applications.