Metasploit is a penetration testing software that can be used to test the security of a system by finding and exploiting vulnerabilities. It can also be used to test the effectiveness of security measures, such as firewall rule sets and intrusion detection systems. Metasploit can be run on Windows, Linux, and macOS platforms. The software is released under a free and open source license.Metasploit is a powerful tool that should be used with care. Inexperienced users can easily damage systems or expose sensitive data. However, when used correctly, Metasploit can be an invaluable asset for penetration testers and security professionals.