Gravel is a loose aggregation of rock fragments that can vary in size from small pebbles to larger stones. It is commonly used in construction, landscaping, and road building due to its durability and drainage properties. Gravel is typically classified into two main types: coarse gravel, which consists of larger particles, and fine gravel, made up of smaller fragments. Gravel is often sourced from riverbeds, quarries, or pits, where it is extracted and processed for various uses. It serves as a base material for driveways, pathways, and foundations, and is also used in concrete production and asphalt mixtures.