What is WAF?

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WAF stands for “Web Application Firewall”.

WAF is a security measures to protect website from attack that abused vulnerability of web application.

WAF is specialized of attack that abused vulnerability of web application.

Using WAF, you can prevent SQL injection, cross-site scripting, etc.

Difference with Firewall

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Firewall is a security measures of network level.

It prevent unauthorized access based on IP address, port number, etc.

So Firewall and WAF are completely different things.

Difference with IPS

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IPS stands for “Intrusion Prevention System”.

IPS is a security measures of OS and middleware.

It prevent unauthorized access that distributed denial of service (DDoS) attacks.