As the use of web applications grows, so does the need to ensure their security. Web Application Penetration Testing, or "pentesting," is one way to find and fix potential security vulnerabilities. Pentesting can be used to test both public-facing and internal applications. During a pentesting engagement, testers attempt to exploit weaknesses in an application's design, functionality, or configuration. By doing so, they can gain access to sensitive data or perform other unauthorized actions. In addition to finding and exploiting vulnerabilities, pentesters also work to identify the underlying cause of the vulnerability. This information can then be used to fix the problem and prevent future attacks. Pentesting is an important part of keeping web applications secure, and it should be performed on a regular basis.