Sony PlayStation 4 Quick Start Manual page 3

Connect to a LAN cable (sold separately).
No Wi-Fi connection? You can use a LAN cable to connect your PS4™ system
to the Internet instead.
To connect your PS4™ system to the Internet via Wi-Fi, do not connect a LAN
cable.
Rear view
LAN cable
(sold separately)
We recommend connecting your PS4™ system to the Internet to get the most out of it.
LAN port
Type of connection:
Router Internet connected device
such as a modem
To the Internet