The wireless network which is set up for a single session and does not need a wireless base station or a router is termed as an ad hoc network. It does not rely on a pre-existing infrastructure, rather each node participates in routing by forwarding data to other nodes dynamically. On the basis of the applications, ad hoc networks can be classified into vehicular ad hoc networks, smartphone ad hoc networks, iMANETs, wireless mesh networks, army tactical MANETS, etc. These are mostly wireless local area networks. This book outlines the current status and future trends of ad hoc networks in detail. It will also provide interesting topics for research which interested readers can take up. The book is appropriate for students seeking detailed information in this area as well as for experts.