A network security key is basically your Wi-Fi password — it's the encryption key that protects your internet. There are three different kinds of network security keys: WEP, WPA, and WPA2, each more ...
WPA2 is the security protocol for Wi-Fi. It replaced WEP, which was hacked many years ago. While WEP is still supported by most wireless access points, WPA2 is now the recommended security measure.