The security setting that scrambles your Wi-Fi traffic so people nearby cannot read it.
Like talking in a private language that only people holding the Wi-Fi password can understand.
A small office kept an old printer that only worked with an outdated Wi-Fi setting, and left the whole network on it. A neighbour in the car park could read the traffic.
Network covers the access points and the staff and guest Wi-Fi settings, including keeping encryption current.
Which Wi-Fi security setting should I choose?
WPA3 if every device supports it, otherwise WPA2 with a long password. Avoid anything older.

Every WILDCARD card exists to solve one named problem. Find yours.