This came from IT Architect Magazine:

What does application protection mean, and how do the various market segments-including firewalls, Intrusion Prevention Systems (IPSs), and application-specific firewalls-implement their solutions?

Security vendors liberally sprinkle their marketing literature with claims about their ability to protect Web, e-mail, and other applications. But what does application protection mean, and how do the various market segments-including firewalls, Intrusion Prevention Systems (IPSs), and application-specific firewalls-implement their solutions?

Applications can be attacked through the protocols that carry them, or by manipulating the logic of the application code itself. Understanding how different types of attacks are carried out will help you assess your risk and better understand how to protect yourself.

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http://www.itarchitect.com/shared/article/showArticle.jhtml;jsessionid=00NXZCH5QREQIQSNDBOCKH0CJUMEKJVN?articleId=22103705&classroom=

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