Covalent organic frameworks (COFs) are a class of porous organic polymers consisting of covalently bonded organic building blocks. These structures exhibit high surface areas, uniform pore sizes, and tunable functionalities, making them promising candidates for a wide range of applications including gas storage, catalysis, sensing, and drug delivery. COFs are characterized by their crystalline nature and well-defined structures, which can be designed and synthesized with atomically precise control. Research in this area focuses on developing new synthetic strategies for COF fabrication, exploring their properties and potential applications, and understanding their structure-property relationships. Some key challenges in the field include improving the stability and porosity of COFs, as well as enhancing their performance for specific applications.