Directory submission is a one way link building method in which you can submit your site link to another sites and get backlinks from there. It improves your traffic, visitors and improve your search engine results.
Web address list obedience is a normally used way to make back-links.
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It refers to the process of adding your website to a web directory. The directory submission process involves submitting your website URL along with other details of your website to the most appropriate category.Directory submission is a way to create such links to make your presence felt through out the web.Submitting links to directories serve as the directions for the search engine spiders. The more frequently they see a link the more the chances of getting to your site.
In my opinion Directory submission increases your visibility in search engine. It helps your site to index fast in search engine. It gives you quality backlinks.