In Netflix-style access control, a household is the set of devices associated with the main place where a subscription is meant to be used. It is not a family tree or billing group; it is an entitlement boundary that helps a platform decide which devices and sign-ins look legitimate for a shared account.
This matters in cyber security because identity systems often use the household concept to reduce credential sharing and detect access from outside the expected environment. A platform may compare device location, network signals, or recent verification activity before allowing playback or profile access. Defenders use similar ideas to limit account abuse, but attackers may try to bypass them with stolen passwords, proxying, or inbox compromise. For users, the key risk is that control of the account is no longer the only issue: controlling the verified devices and the recovery email can also affect access.