Description: Gap Filling is a crucial technique in the field of Quality of Service (QoS) used to ensure continuity in data transmission. Its main objective is to minimize interruptions and data loss that can occur during data transmission in communication networks. This process involves inserting additional data or using compensation techniques to cover the empty spaces that may arise due to variability in network traffic or congestion. By implementing gap filling, a constant flow of data is maintained, which is especially important in time-sensitive applications such as real-time media transmission or online communications. This technique not only enhances user experience by reducing buffering and interruptions but also optimizes network resource usage, ensuring that service quality remains at acceptable levels. In summary, Gap Filling is an essential strategy for maintaining the integrity and smoothness of data transmission, significantly contributing to end-user satisfaction and operational efficiency in communication networks.