Selenium is a tool that allows you to automate browser actions. It is often used by QA engineers to automatically and efficiently test the functionality of web applications. You can create Selenium scripts that examine specific functionality of a web application, ensuring that it produces the expected results.
One of the types of pages that you need to test in the case of most web applications are login pages. Selenium scripts are often used to ensure that changes in the web application do not break the login functionality. These Selenium scripts can now be converted and used by Acunetix to log into the site as part of the security scan.