A wall is a structure that defines an area, carries a load, or provides shelter or security. There are many kinds of walls:

  • Defensive walls in fortification
  • Walls in buildings that form a fundamental part of the superstructure or separate interior sections, sometimes for fire safety
  • Retaining walls, which hold back earth, stone, or water
  • Walls that protect from oceans (seawalls or rivers levees)
  • Permanent, solid fences
  • Border barriers between countries
  • Brick wall
  • Stone wall

https://en.wikipedia.org/wiki/Wall

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Carl Sagan
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