Currently in networking field green computing technology has made a great impact in the environment, which makes it more efficient and proper use of network resources and less consumption of energy. The concept of Green computing technology in communication network is explained here. The computing technology is considered over communication network and this communication network is broadly categorized as infrastructure (wired) and wireless networks, also called as ADHOC network in which mobile nodes and sensor nodes are responsible for communication. In this work there many different technologies are discussed which emphasize on green computing, related to both the type of communication network and also provide an overview of network energy saving studies in different areas which are involved in data transformation.