An online directory is a listing of World Wide Web. In addition, it is the collection of high PR websites which are arranged in various categories and subcategories. The process of submitting your website link to the web directory site is called Directory Submission.
In addition, it helps to bring high-quality backlinks for your site which increases site rating.
So if you need to get backlinks for your site then you have to submit your website or blog in web directory in suitable category or subcategory which includes details.