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Wireless sensor networks (WSNs) consist of many sensor nodes. These networks have huge application in habitat monitoring, disaster management, security and military, etc. Wireless sensor nodes are very small in size and have limited processing capability with very low battery power. This restriction of low battery power makes the sensor network prone to failure. Data aggregation may be effective technique in this context because it reduces the number of packets to be sent to sink by aggregating the similar packets. In this paper we put our attention into various data aggregation algorithms in wireless sensor network. Data aggregation technique increases the lifetime of sensor network by decreasing the number of packets to be sent to sink or base station. Here, we first explore the data aggregation algorithms on the basis of network topology, then we explore various trade offs in data aggregation algorithms and finally we highlight security issues in data aggregation.