A railing can be defined as a safety feature used in architectural structures or as a part of a building. It is typically used to prevent falls from heights, enhance safety, or restrict access to a specific area. Here are the general characteristics of railings:

• Safety: Railings are used to prevent falls from heights. They are specially used to ensure safety on staircases, terraces, balconies, roofs, and similar areas.
• Restriction: Railings can also be used to create boundaries for specific areas. For example, a railing placed along the edge of a garden creates a clear boundary between the garden and the outside space.
• Aesthetics: Railings can be part of the architectural design and contribute to the overall aesthetics of a structure. They can be made in various materials and designs, adding a visual element to the building.
• Guidance: Railings can be used to guide people in crowded areas or along a specific route. For instance, the balustrades on a bridge can direct pedestrian traffic to follow a particular path.

Railings are typically made from metal, wood, glass, or composite materials and can be designed in various ways depending on the structure and intended use.