Aimy No Generator
By default this information is set in the source code of your website to "Joomla! - Open Source Content Management - Version X.X.X".
The information about the content management system may be used to exploit any security vulnerabilities known for this CMS and version. Therefore, banning the generator information increases the security of your website, making it harder for unskilled attackers to gather the information needed to launch a successful attack.
Aimy No Generator is easy to use and set up within less than 3 minutes: Install and activate the plugin - that's all!