An .htaccess file is a text file which incorporates directives which tell a server how to operate in certain cases. It must be positioned in the folder in which these directives should be carried out. A lot of script-driven apps employ this type of a file to work efficiently - WordPress and Joomla, in particular. You can use this kind of a file with custom content as well and do quite a lot of things - block an IP address, an entire network or certain Internet sites from accessing your site, set personalized error pages that will show up instead of the server-generated ones in case a visitor encounters some error on the site, forward a domain or a subdomain to another web address, set up a password-protected area and much more. With an .htaccess file, you shall have much better control over your web presence.