Ghosh, Sudipta2022-03-242022-03-242021-0730p.http://hdl.handle.net/10263/7314Dissertation under the supervision of Dr. Sourav ChakrabortyGraph coloring is a well known problem with wide-ranging applications. The vertex and edge coloring problems have been studied in various models of computation. Rainbow coloring is a type of edge coloring that also acts as a connectivity measure for graphs. It was first introduced by Chartrand et al. in 2008.In 2011 Chakrobarty et al. proved that, it NP-Hard to compute rainbow connection number of a graph. In this thesis first we have define some notation for graph and rainbow coloring. Then we do a literature overview of the results about rainbow coloring. In the final part we have proved that, if G is a square of tree, then rc(G) 2 {diam(G),diam(G) + 1},and the corresponding optimal rainbow coloring can be found in the time that is linear in the size of G.enRainbow coloringEdge Rainbow ColoringGraph coloringSquares of TreesOther