A mount attaches one filesystem path, disk, or shared folder into another environment so it appears available at a chosen location. In practice, a container or subsystem can be given access to a host directory, removable media, or network share through a mount point. This is useful for development and automation because it lets tools read and write files without copying them first.
In cybersecurity, mounts matter because they can cross trust boundaries. If a container or low-privilege process can mount sensitive paths, it may read secrets, alter configuration, or reach data it should not see. Attackers may abuse overly broad mounts to escape a sandbox logically, even if the runtime stays technically isolated. Defenders reduce risk by limiting mount permissions, using read-only mounts where possible, and reviewing what host paths are exposed to workloads.