Quality of Service (QoS) refers to the overall performance of a network or service, particularly in terms of its ability to deliver data reliably and efficiently. It involves managing bandwidth, latency, and packet loss to ensure that applications, such as video streaming or online gaming, function smoothly. QoS is essential for maintaining user satisfaction and optimizing resource usage. QoS techniques can prioritize certain types of traffic over others, ensuring that critical applications receive the necessary resources. For example, during peak usage times, VoIP calls may be prioritized over file downloads to maintain clear communication. This helps organizations provide a better experience for their users.