Wall

A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including: * Border barriers between countries * Brick walls * Defensive walls in fortifications * Permanent, solid fences * Retaining walls, which hold back dirt, stone, water, or noise sound * Stone walls * Walls in buildings that form a fundamental part of the superstructure or separate interior rooms, sometimes for fire safety * Glass walls in which the primary structure is made of glass; does not include openings within walls that have glass coverings as these are windows * Walls that protect from oceans (seawalls) or rivers (levees) Provided by Wikipedia