ArpGuard protects your Mac by keeping an eye on your Internet network. Even though Mac OS X is already well protected, is vulnerable to a Man in The Middle attack, which can compromise your passwords, bank account information, credit card information and even gain unauthorised access to your Mac. This type of attack is increasingly more popular and if you had ever connected to a public network or even a private one you might already been compromised. Web sites that you browse are not always secure and can compromise sensitive information.
After you will install ArpGuard and click the Start ArpGuard button, the application will minimise and will start watching for any hackers that might compromise your network. ArpGuard will detect any suspicious activity.