A capture file is a digital file that stores recorded network traffic, typically collected using packet-sniffing tools like Wireshark or tcpdump. These files contain detailed data about network packets, including headers and payloads, which are essential for analyzing network performance, troubleshooting issues, or investigating security incidents. Capture files are commonly used by cybersecurity professionals to review and reconstruct network activity, detect malicious behavior, or identify vulnerabilities. The most common format for capture files is .pcap (Packet Capture), but other formats exist depending on the tool used. Proper handling and analysis of capture files are crucial for effective network forensics and incident response.