Snort is an open-source Network Intrusion Detection and Prevention System (NIDS/NIPS) developed by Cisco. It is used to monitor network traffic in real time, analyze packet content, and detect a wide range of network-based attacks and suspicious behavior.

Features of Snort:

• Real-time traffic analysis and packet logging.
• Detection of various attacks such as port scans, buffer overflows, and malware.
• Customizable rule-based system for intrusion detection and prevention.
• Supports multiple modes: sniffer, packet logger, and IDS/IPS.

To check the version of Snort, run $ snort -V on your terminal.

Disclaimer: Snort is an open-source project licensed under the GNU General Public License (GPL). It is maintained by Cisco Systems. Snort is provided "as is," with no warranties or guarantees. Use it at your own discretion for security monitoring purposes.