Sand and gravel are natural materials commonly used in construction and landscaping. Sand consists of fine particles, while gravel is made up of larger, coarser stones. Both materials are essential for creating concrete, filling in spaces, and providing drainage in various projects. These materials are often sourced from riverbeds, lakes, and quarries. Sand is typically used for making concrete and mortar, while gravel is used for road construction, as a base for foundations, and in drainage systems. Their versatility makes them vital components in the building industry.