This article provides a detailed examination of vacuum casting and die casting, focusing on their processes, materials, benefits, and applications. Vacuum casting serves rapid prototyping and low-volume plastic production needs, offering high detail fidelity and cost-effective tooling. Die casting excels in high-volume production of strong, precise metal parts, with vacuum die casting enhancing quality further by reducing porosity. Understanding these fundamentals is essential for selecting the right casting method aligned with project goals and production demands.