+A **Waiting Line** (or queue) is a sequence of entities awaiting a service or resource. This common phenomenon represents a temporary bottleneck in various systems, from [Traffic Flow](/wiki/traffic_flow) to [Computer Systems](/wiki/computer_systems), and is a central concept in [Queueing Theory](/wiki/queueing_theory).
+## See also
+- [Service](/wiki/service)
+- [Customer](/wiki/customer)
+- [Optimization](/wiki/optimization)
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