Its mostly to help with back link building. If the directory ranks high then it will help get you indexed. Remember Google's looking for quality not quantity.
Directory submission means submitting your website link with other details in web directory at specified category. Doing this improves your link popularity. Directory submission sites are available for free as well as for paid. web directory is same like phone directory that contains list of websites on each category. you can also hire experts from SEOclerks.
1.The main purpose of directory submission is that it helps in distinguish your websites to different categories and sub categories so that it will help google to index easily.
2.link popurality
3.generate backlinks
high quality directories can give you high quality Do follow backlinks yes, they share their links with hundreds of sites. link juice is also shared but at least they are ethical. no chance of banning your site for bad linking.
Benefits of Directory submission are as follows build one way quality back links get your website indexed improvement in search engine rankings help search engines to find you build relevant keywords and links for your website create branding for your business boost your global link popularity.
Directory Submission is one of the basic technique of off-page SEO. Directory Submission is a process of selecting a website and then adding it to the other, basically a directory on the internet that is a web directory is a website that offers a very vast lost of other websites, this technique is helpful ranking of your site in search engine.