Barbed wire is a wire or strand of wires having small pieces of sharply pointed wire twisted around it at short intervals, used chiefly for fencing in livestock, keeping out trespassers, etc.From home boundaries to jails, these wires have been extensively used for protection. This type of fencing wire is generally made from iron. These are available in various styles. Some run in a straight line, while others are rounded making a mesh. This type of fencing keeps unwanted wild animals away from animal sheds and fields.