If you are using WiFi in your home or in your office than you are facing the problems like someone are using your network for surfing the Internet, in simple if someone hack into your network or if you are allow someone to use your network while they are consuming all of the bandwidth now if you want to kick them you can do this. Lets consider an another example if you are using WiFi Internet on your Android phone while you are in public place like in the coffee shop, transportation system and other place and you want to use Internet but the connection is very slow because a lot different people are using the same network (bandwidth).
Note : Your Android device must be rooted if you want to run this app, as it will not work on non rooted devices.
The app is actually more simple than what you might anticipate from the task that it manages to accomplish. The best part about this app is that, once you kick someone off the Wi-Fi network, that person would continue to see the network and and the signal strength as it was. It would appear as if the internet has just slowed down to an excruciatingly slow speed.
Besides pranking people, pure selfishness, and meanness, WiFiKill might have some use for controlling devices on your own network. For example, if you’re a small business owner and you don’t want to allow your staff to use the Wi-Fi network during certain hours, you or your IT admin could kill their connection (of course, you could do this from the router too, but perhaps you want to do it from your phone). Perhaps you’re a parent and want to cut off an errant teenager’s internet access.
This application was available on android market but now they have pulled this application, however we have another link from where you will get the application and video tutorial of WiFi kill for android.
WifiKill For Android : Remove other devices from network