Wireless Sensor Networks (WSNs) can be well-defined as one which can configure itself. It is infrastructure-less networks deployed to observe physical or else ecological surroundings, for instance, hotness, sound, tremors, pressure or impurities. All the information is sensed by the sensors which supportively pass the data through the network to a sink where the data can be perceived and investigated. Since these nodes are deployed in unhuman conditions so preserving their batteries is very challenging task. Clustering, described by LEACH protocol, is one of the techniques which helps in increasing their lifetime. This paper describes recent studies about the clustering approaches that are used to preserve the batteries of sensor nodes to make them work for the longer duration of time.