A natural process is a change or structure produced by physical forces, environmental conditions, or normal system behavior rather than deliberate design. In security work, that distinction matters because not every unusual pattern is an attack: hardware wear, temperature shifts, packet loss, file corruption, log rotation, and software aging can all create symptoms that look suspicious.
Analysts use the term to separate benign causes from malicious ones. If a server reboots after a power fluctuation, or a disk develops bad sectors through normal wear, the event may be natural rather than hostile. Good defenses rely on baselines, sensor data, and careful investigation so that responders do not confuse expected drift with compromise, and do not miss real intrusions hiding behind ordinary system noise.