A staircase is a structure designed to connect different levels of a building or structure by a series of steps or stairs. Staircases can be found in various forms and materials, ranging from simple wooden stairs in residential homes to elaborate, architecturally significant designs in public buildings and monuments.

Staircases serve both functional and aesthetic purposes. Functionally, they provide access between floors or levels, facilitating movement within a building. A well-designed staircase should be safe, comfortable to use, and compliant with building codes and regulations regarding dimensions, handrails, and tread and riser dimensions.

Aesthetically, staircases can contribute to the overall design and character of a building. They can be designed to complement the architectural style of the space, using materials such as wood, metal, glass, or stone to create a desired aesthetic effect. Additionally, staircases can be focal points in interior design, serving as dramatic features or focal points within a room or building.

Staircases can take various forms, including straight stairs, spiral stairs, curved stairs, or grand staircases with multiple landings. The choice of staircase design depends on factors such as space constraints, architectural style, and the intended use of the building or structure.