This is usually a fence of 5 wires or more. It has more elasticity than barbed wire. It is easy to install with the use of a wire spinner. One or 2 wires are sometimes electrified. It is often used where electric fence isn't suitable such as urban areas.
Smooth wire is stronger and easier to install than barbed wire.
Smooth wire may not be as effective in controlling cattle because of the lack of barbs. Barbed wire can be more effective in controlling some animals than smooth wire. However it is more time consuming and tedious to put up. Barbs will catch on the staples reducing the whipping action. There is also a safety concern for both the fence builder and the animals.