You keep getting in arguments with your roommates about slow network performance when playing video games at home. You notice whenever they are all streaming TV or movies using their smart TVs your latency goes up and bandwidth goes down. What feature of your router could you use to prioritize your traffic over theirs and get back to "pwning noobs"?
You need to upgrade to a level 3 switch
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Answer Description
Quality of Service (QoS) is a common feature on routers that allows you to set minimums and maximums to certain types of traffic and give priority to some traffic over others. For example you could set a max bandwidth for some devices or simply give your devices network priority over other device's 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 priorities to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow.
Quality of service is particularly important for the transport of traffic with special requirements. In particular, developers have introduced Voice over IP technology to allow computer networks to become as useful as telephone networks for audio conversations, as well as supporting new applications with even stricter network performance requirements.
Quality_of_service - Wikipedia, the free encyclopedia 