What is Mod Security For WHM and Cpanel

I would like to know what Mod Security is , its main purpose and how to implement it for WHM and cpanel accounts?
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madunix (Fadi SODAH)Chief Information Security Officer Commented:
mod_security is leading open-source web application firewall. To use its fill potential, one must have good knowledge about HTTP protocol and web server internals. It has got many advanced features and  it can scan entire request's headers/body/response and response etc. You can write fairly advanced rules with this module. However,it has considerable impact on performance depending on rules applied,hardware capacity and incoming traffic. For medium to large deployments, it is suggested to have a separate installation of mod_security and redirect valid request to server behind it. Again; be aware this could be a bit expensive on your processor, depending on how many rules you enable, but it does have real-time Denial of Service, flooding, and slow connection protection.

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X-quisiteAuthor Commented:
Thank you , your explanation is great and the links are exactly what i needed
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