Zeroization is the deliberate clearing of storage so that previous contents cannot be recovered by another user, workload, or attacker. It is used on disks, virtual volumes, memory buffers, caches, and temporary files when data is being retired, reassigned, or destroyed.
In cyber security, zeroization matters because deletion alone often leaves residual bytes behind. On shared cloud platforms, a reused container, snapshot, or ephemeral disk may expose fragments of secrets, credentials, or application data if cleanup is incomplete. Strong zeroization helps prevent storage remanence and supports tenant isolation. Defenders implement it with secure wipe routines, cryptographic erasure, and teardown controls that overwrite or invalidate old data before resources are reused. Attackers, by contrast, look for weak cleanup paths, recycled infrastructure, and overlooked scratch space where sensitive content may still be readable.