Comprehensive Summary UiO‐66, a prototypical and stable zirconium‐based metal‐organic framework (MOF), consists of zirconium‐oxide clusters (Zr 6 O 4 (OH) 4 ) and benzene‐1,4‐dicarboxylate (BDC) organic linkers. It exhibits abundant active sites, a high specific surface area, a tunable pore structure, and exceptional chemical and thermal stability, making it highly advantageous for various practical applications. The integration of functional components within UiO‐66 has been shown to optimize its electronic properties and coordination environment, thereby enhancing its multifunctionality and catalytic performance. This review highlights the analysis of structural characteristics of UiO‐66, explores various modification strategies such as the introduction of functional organic linkers, selection of metal nodes, defect engineering, and doping with external functional components, and discusses its applications in environmental remediation and energy‐related fields. Key Scientists