Linux Namespaces
Kernel abstraction restricting what system resources (processes, network interfaces, mounts) a process tree can observe.
Mechanism & Definition
A Linux kernel feature that encapsulates host system resources into isolated contexts. Key namespaces include PID (process IDs), NET (interfaces & routing tables), MNT (filesystem mounts), IPC (inter-process communication), UTS (hostnames), and USER (UID/GID mappings).