Drush is a command line interface tool for drupal CMS which is very useful for time taken tasks of admin end. If you are having drush command on your fingure tips, it'll save your a lots of time and makes you more productive. If you are new to drush, you are definitely going to enjoy your ride of commands over drupal. In drupal 8, we have lots of drush commands but here we are going to elaborate most useful drush commands in drupal 8
Virtual Host is a very powerful feature of any server. By using this feature, you can run multiple sites on a single server that has working apache server and share its resources like memory and processor cycles.
If you found error i.e. Page not found on any site, it means that is 404 error which is originated by HTML protocol. It means that this page doesn't exist on site where you are trying to visit. Sometimes, we users trying to visit any relative url on your wordpress site which doesn't exists.
Apache is most powerful server which is already serving more than half of all active websites. Features of apache server includes support of multiple programming languages, authentication mechanism and server-side scripting. You can be enhanced it's features by adding several kind of extensions.
Drupal 7 provides a core feature i.e. clean url for resolving this issue. But for implementation of this feature, we need to enable it from backend for checking compatability of our site for making urls clean. It works with server configurations in .htaccess file