.htaccess

The .htaccess file in your web space allows you to enable or disable functionality offered by the Apache Web Server. For instance, you can set your 404 page, protect your content with a password, or prevent other websites from linking to your images and videos.
Unless you have a lot of technical experience, you shouldn’t make changes to your .htaccess file yourself. Your hosting provider can do this for you, if you contact customer support. Messing around with your .htaccess file can cause problems with your website – and may even prevent you from being able to logging into the backend of your website.