1 An Energy-Efficient Routing Mechanism (EERM) for Wireless Sensor and Actor Networks Muhammad Kashif Saeed 1 , Khalid Mahmood 1 , Mahmood ul Hassan 2 , Ansar Munir Shah 3 Jahangir Khan 1 , Muhammad Asshad 4 1 Department of Information Systems, King Khalid University, The Kingdom of Saudi Arabia 2 Najran University, Najran, Kingdom of Saudi Arabia 3 Department of Computer Science & IT, Institute of Southern Punjab (ISP) Multan, Pakistan 4 Department of Information Technology, University of Haripur, KPK, Pakistan Abstract - Wireless Sensor and actor networks (WSANs) are the most vital research area in the wireless communication field. It consists of sensors, actors, and the base station, where actor nodes work as these networks' spine. The network's main objective is to sense the critical information from the area of interest and then send it to the base station. After that, it can make accurate decisions. This project proposes an Energy- Efficient Routing Mechanism (EERM) technique for the effective routing process. It works in three phases, which are Network initialization, data gathering, and routing. Once the node senses the data and tries to forward it to the base station, it chooses the sensor/ actor nodes from its neighbors having more energy and less distance towards the base station, a final node. As a result, there are significantly fewer chances of data loss due to battery depletion. Moreover, it confirms that there is no data duplication. After successful data transmission, the node will be set as in sleeping mode to save energy. EERM evaluates with other gossiping routing techniques like FELGossiping, ELGossiping, and LGossiping. It notices that there is less data packet loss in it. More nodes are alive in additional iterations due to energy-efficient solutions, which increases the network lifetime. Keywords: Wireless Sensor Networks, Routing protocol, Wireless Sensor and Actor Networks, Gossip Protocol, Nearest Neighbor, Energy efficient 1 INTRODUCTION Wireless Sensor and Actor Networks (WSANs) consist of sensors, actors, and a base station where sensor nodes collect the data by sensing operations. These sensor nodes send the data to the actor nodes, which perform specific processing actions on the received data. After that, actor nodes send the data to the basestation[1-2]. Normal sensor nodes have limited resources, like the battery, transmission power, limited communication range, and processing powers. Actor nodes are powerful nodes than ordinary sensor nodes with *Corresponding author: muhammadkashifs@gmail.com