A Network Packet Capture Appliance is a high-performance, hyper-converged system designed to record network packet data directly to onboard storage (HDD or SSD), a process commonly referred to as capture-to-disk (CTD). It continuously archives packet data in standard PCAP or PCAP-NG format over time, making it easily searchable and retrievable for purposes such as troubleshooting, forensic investigation, or compliance auditing.