This read-only Counter64 is the count of packets dropped in the send direction for this VPath. An admin uses this alongside send bytes dropped to quantify outbound packet loss toward a specific remote site, which directly affects the quality of any real-time application (like voice) traveling that direction. For example, a rising send-direction packet-drop count on the VPath serving a call center branch would explain reports of outbound audio glitches on calls placed from that branch toward headquarters.