Lipid-based drug delivery systems have emerged as a cornerstone in modern pharmaceutical research, offering innovative solutions to overcome limitations associated with conventional drug therapies. The article provides comprehensive information about liposomes and lipid nanoparticles by showing their structural foundations and various ways to categorize them and their different formulation techniques which follow Quality by Design principles. The development of advanced nanocarriers which include tocosomes and nanoliposomes and programmable lipid nanoparticles has transformed drug delivery systems from their original liposome design through enhancements in product stability and product targeting capabilities and product delivery control mechanisms. The study compares liposomal systems with surfactant-based systems to show that carrier selection needs to match both therapeutic needs and formulation capabilities of the drug. The article describes how lipid nanoparticles function in targeted cancer therapies and neurological disease treatments and systemic disease management while demonstrating their capacity to enhance drug absorption and decrease toxic effects throughout the body. Emerging delivery platforms such as oral, dermal, and rapidly dissolving systems highlight advancements in patient-centric drug administration. The combination of smart programmable nanocarriers and artificial intelligence technology has enabled accurate drug delivery control which supports the creation of customized medical treatments. The existing progress needs to address three major challenges which include problems with producing products at an industrial scale and obtaining regulatory authorization and maintaining long-term safety. Future perspectives focus on developing multifunctional nanocarriers which respond to stimuli and provide solutions for diverse medical treatment requirements. The current medical field has achieved a revolutionary change through lipid-based drug delivery systems which connect traditional drug delivery methods with cutting-edge medical treatment methods.