Why do we have fences?

Fences are used to physically show where your home lot start and where it ends.  It is also used to give you privacy from your neighbors and private space you can enjoy with friends, family and pets.  Fences can be decorated with plants or lights, or they can be painted to match another exterior color (e.g. house bricks).  Fences are made out wood planks that are nailed to perpendicular 2.x4 planks of wood with steel nails.