During setup, you'll be prompted to select a Wi-Fi security level as well as a password. WPA2 is the greatest option right now. (Don't forget to use a strong password!)
WPA2 is a security protocol that is widely used on Wi-Fi networks. Since
2006, WPA2 (Wireless Protected Access 2) has superseded the original WPA technology on all approved Wi-Fi devices, and it is based on the IEEE 802.11i data encryption technology standard.