A VertexRDD contains the set of vertices or nodes in a special data structure and an EdgeRDD contains the set of edges or links between the nodes/vertices again in a special data structure. Both the VertexRDD and the EdgeRDD are based on RDDs and the VertexRDD deals with every single node in the graph while the EdgeRDD contains all links between all nodes. In this section, we will look at how to create VertexRDD and EdgeRDD and then use these objects in building a graph.