Contents I. Introduction
Wireless Sensor Networks (WSN) is been a huge evolution (growth) in the current years. The growth is particularly because of the availability or requirement of small size sensors, which senses the environment with the help of tiny size sensor nodes and which is used in the communication of sensed data. The WSN are usually made up of large tiny sink node and a sensor nodes. Multipath routing is the ability of routing the data (information) from each source to the destination by using multiple alternative paths used for gradual network performance improvement. The network parameter includes fault tolerance, increased bandwidth, or improved security etc. As multiple alternative paths transmit the data, the delay reduces and the network performance increases. WSN routing requires such environment with more robust network performance. Multiple such routing techniques exist in the literature for its usage in WSN environment based on various parameters. The multipath routing technique has experienced improved efficiency in WSN to discover and use alternate paths for data transmission between sources and sink. The limitations of the routing are overcome by the introduction of multipath routing techniques
