Wireless sensor systems (WSNs) are utilized in different applications from medicinal services to the military. Because of their limited, little power sources, energy turns into the most valuable asset for sensor nodes in such networks. To optimize the usage of energy resources, researchers have proposed ideas from broadened points. Clustering of nodes plays an important role in conserving the energy of WSNs. Clustering of nodes plays an important role in conserving the energy of WSNs. Clustering approaches focus on resolving the conflicts arising ineffective data transmission. In this article, we have outlined a few modern energy-efficient clustering approaches to improve the lifetime of WSNs. The proposed clustering techniques are: