Congestion occurs when traffic demand exceeds what a network resource can handle comfortably, creating queues, drops or reduced delivery rates. It can happen inside the home, on an internet access link or elsewhere along a route. The location matters: changing a player setting cannot universally remove competition for an overloaded network resource.
A practical example
Large uploads and downloads can compete with television playback on a household connection. Pausing them during a controlled comparison can reveal whether shared local demand contributes to the problem, without proving that every interruption originates inside the home.
A common misunderstanding
Evening slowdowns are not conclusive evidence of one cause. Compare local traffic, device connection and affected destinations before attributing the pattern to the service or internet provider.
Related terms
Stable technical definition. Editorial approach