The document discusses the network analyzer software Wireshark. Wireshark is an open-source network packet analyzer that allows users to examine network traffic and monitor packets in real-time. It can be used for troubleshooting network problems, examining security issues, protocol development, and learning about network internals. Wireshark supports live packet capture from different network types and can import/export packets to other capture programs. It is available for Windows and various Unix/Linux operating systems.