The advent of 3D cell culture models has revolutionized drug discovery and disease modeling, offering more physiologically relevant systems compared to traditional 2D cultures. These advanced models mimic the in vivo microenvironment, incorporating critical cellular interactions, extracellular matrix components, and gradients of oxygen and nutrients. This research explores the development and application of 3D cell culture technologies, such as organoids, spheroids, and bioprinted tissues, in studying disease mechanisms and evaluating drug efficacy. The study highlights the advantages of these models in recapitulating complex biological processes, including tumor microenvironments, organ development, and tissue-specific responses to therapeutic agents. By employing cutting-edge techniques such as microfluidics, advanced imaging, and computational modeling, the research aims to optimize 3D cell culture systems for high-throughput screening and personalized medicine. The findings underscore the transformative potential of these models in bridging the gap between preclinical studies and clinical outcomes, reducing drug development costs and improving patient-specific therapeutic approaches.