Quality Of Service (QoS) definition in Computer Security terms:
Definition(s): The measurable end-to-end performance properties of a network service, which can be guaranteed in advance by a Service Level Agreement between a user and a service provider, so as to satisfy specific customer application requirements.
Note: These properties may include throughput (bandwidth), transit delay (latency), error rates, priority, security, packet loss, packet jitter, etc.
Source(s): CNSSI 4009-2015
A categorization of different types of network traffic to prioritize latencysensitive data over non-latency-sensitive data.
Source(s): NIST SP 800-127
A network property that specifies a guaranteed throughput level.
Source(s): NIST SP 800-58
reference: CSRC Glossary