HCL AppScan, previously known as IBM AppScan, is a family of web security testing and monitoring tools formerly from the Rational Software division of IBM. AppScan is intended to test Web applications for security vulnerabilities during the development process. The product learns the behavior of each application, whether an off-the-shelf application or internally developed, and develops a program intended to test all of its functions for both common and application-specific vulnerabilities. https://en.wikipedia.org/wiki/Security_AppScan