Arc Diagrams are an alternate way of representing two- dimensional Network Diagrams. In Arc Diagrams, nodes are placed along a single line (a one-dimensional axis) and arcs are used to show connections between those nodes. The order of nodes is the key for arc diagrams. The thickness of each arc line can be used to represent frequency between the source and target node.

Pro

Arc Diagrams can be useful in finding the co-occurrence within the data.
It can highlight clusters and bridges quite well if the node order is optimized. it allows to display the label of each node, which is often impossible in 2d structure.

Con

The downside to Arc Diagrams is they don’t show structure and connections between nodes as well as 2D charts do and too many links can make the diagram hard to read due to clutter.