Packet loss occurs when data packets do not successfully reach the intended receiving stage of a network exchange. Its effects depend on the transport and application: some systems resend missing information, while others conceal or skip it. Loss can arise at different points and does not by itself identify a particular router, provider or server as the cause.
A practical example
A damaged local link or a congested path can lose packets during viewing. TCP-based delivery may spend time recovering missing data, while another media arrangement may show brief artefacts or rely on its own recovery behaviour instead.
A common misunderstanding
Do not assign blame from one symptom or an isolated diagnostic result. Establish the affected path, test conditions and whether intermediate devices intentionally limit responses to measurement traffic.
Related terms
Stable technical definition. Editorial approach