Concrete, a substance made of cement, aggregate, and water that is flexible, durable, and dependable, is the most often used material in the world. After water, conventional concrete is the substance that is used the most frequently, and it uses a lot of Portland cement. Mining has a negative impact on the environment, just as the manufacturing of Portland Cement (OPC) does due to the release of carbon dioxide. Finding a replacement for the current cement concrete is important because of the sharp growth in carbon emissions. Another material used in construction that is produced by chemically processing inorganic minerals is Geopolymer concrete. Throughout the world, fly ash is a by-product of thermal power plants' use of coal. An aluminosilicate gel that serves as a concrete binder is created when silica-rich fly ash and alumina are activated with an alkaline activator. It is one of the best building materials for ordinary concrete without the use of large quantities of Portland cement. In some applications, geopolymer concrete is a very friendly alternative to Portland cement concrete. This article reviews the properties and applications of geopolymer concrete.