There are many reasons why you'd want to check if an unauthorized party is using your wireless network. It may be that you're experiencing a slow Internet connection or you simply don't want anyone getting a free ride while you pay the bill. Of course, there are also security implications if this person can somehow access files on your network, and even legal implications if he uses your connection for piracy or other illicit activities.
Whatever the case it's better to stay on the safe side. Many of you may have already taken some basic precautions when setting up your wireless network and know your way around troubleshooting these issues.
This brief guide is aimed at novice users in need a hand to find out if their Wi-Fi is being stolen. We've also thrown in a couple of suggestions on how to get something in return if you don't actually mind sharing your Wi-Fi.