A staircase is a set of steps that allows people to move between different levels of a building. It usually consists of a series of flat surfaces called treads, which you step on, and vertical parts called risers, which connect the treads. Staircases can be found in homes, schools, and public places, making it easy to access upper or lower floors. Staircases can come in various designs, such as straight, spiral, or curved. They can be made from materials like wood, metal, or concrete. Some staircases even have handrails for safety, helping people like children and the elderly navigate them more easily.