 Abstract the graphitic carbon nitride, G-C3N4, which is a two-dimensional conjugated polymer has drawn broad interdisciplinary attention as a low-cost, metal-free, and visible light-responsive photocatalyst in the area of environmental remediation. The G-C3N4-based materials have excellent electronic band structures, electron-rich properties, basic surface functionalities, high-physical chemical stabilities, and are earth abundant. This review summarizes the latest progress related to the design and construction of G-C3N4-based materials and their applications including catalysis, sensing, imaging, and white-light emitting diodes. An outlook on possible further developments in G-C3N4-based research for emerging properties and applications is also included. This article was authored by Ai Wu Wang, Chun Dong Wang, Li Fu, and others. We are article.tv, links in the description below.