Graphitic carbon nitride (g-C3N4), is a synthetic polymer made up of carbon, nitrogen, and some impurity hydrogen that is linked together using tris-triazine-based patterns. Because of the inclusion of N and H atoms, it has electron-rich characteristics, basic surface functions, and H-bonding motifs, compared to the bulk of carbon materials. Consequently, it’s seen as a possible replacement for carbon in material applications. A brief introduction to g-C3N4 is included in this chapter, as are the methods for synthesizing this material with various textural structures and surface morphologies, as well as its physicochemical properties. Furthermore, four parts of g-C3N4 applications are discussed. We anticipate that this work will motivate readers to look for new applications for this material in catalysis and other domains.