This review discusses the shape-controlled synthesis of metal nanocrystals, emphasizing the interplay between simple chemistry and complex physics. Metal nanocrystals, with dimensions between 1 and 100 nm, are crucial in modern science and technology due to their unique properties. Controlling their shape is essential for optimizing their performance in various applications. The article explores the nucleation and growth mechanisms of metal nanocrystals, focusing on how experimental parameters influence their shape. It highlights the importance of shape control in applications such as catalysis, sensing, and medicine, where nanocrystals with precisely controlled properties are needed. The review also discusses the challenges in understanding the complex physics behind nanocrystal formation and the role of surface capping agents in controlling their shape. The article concludes with perspectives on future research directions in this field. Key concepts include the influence of surface energy, the role of twin defects and stacking faults, and the impact of capping agents on nanocrystal morphology. The review emphasizes the need for a deeper understanding of the underlying mechanisms to achieve precise control over nanocrystal shape and properties.This review discusses the shape-controlled synthesis of metal nanocrystals, emphasizing the interplay between simple chemistry and complex physics. Metal nanocrystals, with dimensions between 1 and 100 nm, are crucial in modern science and technology due to their unique properties. Controlling their shape is essential for optimizing their performance in various applications. The article explores the nucleation and growth mechanisms of metal nanocrystals, focusing on how experimental parameters influence their shape. It highlights the importance of shape control in applications such as catalysis, sensing, and medicine, where nanocrystals with precisely controlled properties are needed. The review also discusses the challenges in understanding the complex physics behind nanocrystal formation and the role of surface capping agents in controlling their shape. The article concludes with perspectives on future research directions in this field. Key concepts include the influence of surface energy, the role of twin defects and stacking faults, and the impact of capping agents on nanocrystal morphology. The review emphasizes the need for a deeper understanding of the underlying mechanisms to achieve precise control over nanocrystal shape and properties.