what is .htacess file?

.htacess file is used to solve the canonicalization issue of a website. It may happen that the home page of the site may take several urls like http://www.example.com or http://www.example.com/index.html or http://example.com . The search engines might treat these url as different and may divide the link juice gained by having various backlinks made with any of these 3 urls. The link juice gets divided between these three urls equally. .htacess file is created to have a single url of the home page so that the link juice is passed onto single url.

.htaccess is a configuration file for use on web servers running the Apache Web Server software. When a .htaccess file is placed in a directory which is in turn 'loaded via the Apache Web Server', then the .htaccess file is detected and executed by the Apache Web Server software.

Htaccess files are hidden plain text files that are on the server to help control how your visitors interact with your website. The htaccess file is also used to block specific traffic from being able to view your website.