Ant's colony exhibit complex structure called ant streets. The authors were observed in several situations such as highway or may have placed some obstacle in the way and see ant's reaction to such disturbances. One of the most surprising behavioral patterns by ants is the ability to find shortest path which is the challenge of today's computer scientists. Ant colony optimization is a probabilistic technique for solving computational problems. This paper explains ant colony optimization is an effective approach for finding a shortest path between two nodes on a network.