Cementitious material refers to substances that can bind other materials together, primarily used in construction. The most common example is cement, which, when mixed with water and aggregates, forms concrete. This mixture hardens over time, providing strength and durability to structures. In addition to cement, other materials like fly ash, slag, and lime can also be classified as cementitious. These materials can enhance the properties of concrete, such as improving workability and resistance to environmental factors. Their use contributes to sustainable building practices by recycling industrial byproducts.