Tcpdump is a powerful command-line packet analyzer that captures and displays packets from a network interface. It allows users to filter, analyze, and troubleshoot network traffic. The tool is often used for network debugging, troubleshooting, and security testing. It is accompanied by libpcap, a portable C/C++ library for network traffic capture. The website provides documentation, tutorials, and resources for using tcpdump and libpcap, including man pages, tutorials, and papers written by various authors. The latest releases of tcpdump and libpcap are available for download, along with current development versions accessible through GitHub.