A bipartite graph is a graph whose set of vertices can be divided into two disjoint sets such that no two graph vertices within the same set are adjacent.
The chromatic number of a graph is the smallest number of colors needed to color the graph such that no two adjacent vertices share the same color.
Since a bipartite graph can be colored using only two colors (one for each set), the chromatic number of a bipartite graph is \( 2 \).