We have seen the advancement in the field of internet due to wireless networking technologies. It gives rise to many new applications. In the past of few decades, we have seen the advancement in wireless networks. The emerging capabilities of mobile devices have given a new direction to the internet, which decreases the cost and allow us to use infrastructure wireless networks and infrastructure less wireless networks (i.e. Mobile Ad Hoc Wireless Network).With so many applications that MANETs provides us, there are still some challenges that have to overcome. We present in this paper, the history of MANET, challenges (issues) involve in MANET and its some applications.