Round Trip Time (RTT) refers to the total time it takes for a signal to travel from a source to a destination and back again. This measurement is crucial in networking, as it helps determine the speed and efficiency of data transmission. RTT is often affected by factors such as distance, network congestion, and the type of connection used. In practical terms, RTT is commonly used in various applications, including ping tests, which assess the responsiveness of a network. A lower RTT indicates a faster connection, while a higher RTT can lead to delays in communication, impacting user experience in activities like online gaming or video conferencing.