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 network resources to ensure that specific performance metrics, such as bandwidth, latency, and packet loss, meet the needs of users and applications. QoS is crucial for applications that require consistent performance, such as video streaming and online gaming. To achieve QoS, network administrators can implement various techniques, including traffic shaping and prioritization. These methods help allocate resources effectively, ensuring that critical applications receive the necessary bandwidth while minimizing delays. By maintaining a high level of QoS, organizations can enhance user satisfaction and improve the overall experience of their services.