Connected Components
The connected components of an undirected graph are the equivalence classes of vertices under the "is reachable from" relation [1].

The graph has three components [1]. Connected Components are identified by the lowest vertex ID in the component.
| Component ID | Components Members |
|---|---|
| 1 | 1,2,5 |
| 4 | 4 |
| 3 | 3,6 |
References
[1] Cormen, T., Leiserson, C., Rivest, R., & Stein, C. (2009). Introduction to Algorithms. The MIT Press.