Routing protocols have been thoroughly investigated in MANET and sensor networks as it forms the basis of packet transfer and thus is a deciding factor for application performance. This chapter describes several algorithms and protocols developed in the domain of adhoc and sensor networks and beyond such as wireless body area network and Internet of Things. Moreover, simulation scenarios, performance evaluation with realistic examples are framed to highlight implementation methods and techniques of the existing protocols and this will work as a tool to the explorer of this book to build new, effective, and efficient applications based on such protocols.