.htaceess : .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.seocutts.com/ or http://www.seocutts.com/index.html or http://seocutts.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.