A railing is a structure that provides a BARRIER or support, typically made of metal, wood, or stone. Fencing is a type of railing that is used to enclose an area, typically made of metal or wood and often with pointed tops. A BALUSTRADE is a railing that is composed of a row of posts topped by a rail, often found on balconies, staircases, and terraces. A FENCE is a type of railing that is used to separate two areas, typically made of wood, metal, or wire. A BARRIER is a type of railing that is used to block access, typically made of metal or wood. Finally, a BAR is a type of railing that is used to provide support, typically made of metal or wood.