A traffic surge is a rapid increase in network requests or user activity over a short period. It can happen when many people visit a service at once, such as during a live event, a product launch, or a breaking news cycle. The key feature is speed: demand rises faster than normal systems or monitoring baselines expect.
In cyber security, traffic surges matter because they can stress servers, overload queues, and raise latency even when the traffic is legitimate. Defenders use capacity planning, rate limiting, caching, and anomaly detection to keep services available and to tell normal spikes apart from abuse. Attackers can also exploit surges by hiding malicious requests inside heavy legitimate traffic or by triggering a denial-of-service style flood that looks similar at first glance. Accurate baselines and event-aware monitoring help teams respond without blocking real users.