Contemporary advances in wireless sensor networks have resulted in many new protocols specifically designed for sensor networks where power awareness is most important consideration. Most of the attentiveness, however, has been given to the routing protocols on the grounds that they would differ depending on the applying and network structure. This paper surveys latest routing protocols for sensor networks and presents the principal categories of routing protocols depending upon the key network parameters taken as basis for protocol. The paper provides the basic brief understanding of routing protocol according to their category.