PSK
Pre-Shared Key
A secret shared in advance to authenticate or encrypt, as in WPA2-PSK.
A Pre-Shared Key is a secret distributed to participants ahead of time and used to authenticate or derive encryption keys, most familiar in WPA2-PSK and WPA3-PSK wireless networks. It is simple to deploy for homes and small offices because no authentication server is required. The drawback is that everyone shares one secret, so a weak passphrase invites offline brute-force attacks and a leaked key forces a network-wide change. Enterprise mode with 802.1X and RADIUS gives per-user credentials instead.
Looking PSK up is step one. Getting tested on it is step two.
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