IPA: /ˈlɒɡɒf/
KK: /ˈlɔgˌɔf/
The action of disconnecting from a computer system or network, usually to end a session.
After finishing my work, I always make sure to perform a logoff to secure my account.
Logoff → It is formed from "log" (from the Old English *logg*, meaning a record or account) and "off" (meaning away or not connected). The word "logoff" means to disconnect or end a session from a computer or system, effectively removing one's record of activity.
Think of 'logging' your activities and then 'disconnecting' ('off') from the system — that's what logoff means.