ELI5: Explain Like I'm 5

Hypercube graph

A hypercube graph is a type of graph made up of small cubes (called nodes) connected together. Each node has four edges that touch the edges of four other nodes. This is like a 3D version of a square graph, which is like a group of squares connected together. All the nodes together make a huge cube shape, which is why it is called a hypercube.