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A fence is a freestanding structure designed to restrict or prevent movement across a boundary. It is generally distinguished from a wall by the lightness of its construction: a wall is usually restricted to such barriers made from solid brick or concrete, blocking vision as well as passage (though the definitions overlap somewhat).
Fences are constructed for several purposes, including: Agricultural fencing, Privacy fencing, Security fencing, and Decorative fencing. Some of the technologies developed for fencing include: Barbed wire fence, Cactus fence, Chain link fencing, Dry-stone wall or rock fence, Electric fence, Ha-ha (or sunken fence), Hedgerows of intertwined, living shrubs, Palisade, Pet fence, Picket fences, Post-and-rail fencing, Split-rail fences made of timber, Snow fence, Stake-and-wire fencing, Turf mounds, Wire netting or wire gauze between posts, Wood-panel fencing, and Wrought iron fencing.