Answer Description
Quality of Service is a networking technique where certain types of traffic are given higher priority than less important traffic. Just like emergency vehicles are given priority on roads, business critical traffic is given higher priority than non-critical traffic.
Wikipedia
Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network or a cloud computing service, particularly the performance seen by the users of the network To quantitatively measure quality of service, several related aspects of the network service are often considered, such as packet loss, bit rate, throughput, transmission delay, availability, jitter, etc In the field of computer networking and other packet-switched telecommunication networks, quality of service refers to traffic prioritization and resource reservation control mechanisms rather than the achieved service quality Quality of service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow
Quality_of_service - Wikipedia, the free encyclopedia