An outerplanar graph is a type of graph in which all of its vertices can be placed on the outer face of a planar drawing without any edges crossing. In other words, it can be drawn in such a way that all vertices are located on the boundary of the outer face, and no edges intersect except at their endpoints. Key characteristics of outerplanar graphs include: 1. **Planarity**: Outerplanar graphs are a subset of planar graphs.
New to topics? Read the docs here!