This document summarizes information about sand and its uses. It discusses that sand is the most consumed raw material after water, and is essential for construction projects like roads, bridges, and buildings. It identifies six main types of sand used in construction, and describes their properties and uses. It also notes that sand is important for producing glass and as an ingredient in concrete, mortar, and plaster. The document concludes by stating that demand for sand is growing globally and in Bangladesh specifically due to increasing population and construction projects.