There are Two types of directory submission services: -
Manual Directory Submissions
In a manual submission service, the submissions are done by hand one after the other. The submitter selects the category, keywords, titles and tags manually. Many of the directories have validations which prevent scripts from submission, but with manual submissions there is no fear of rejections as the submissions are done by hand, so submitters easily navigates through this process without stress. The only disadvantages in this case is that it is time-consuming, but it is a long-term initiative as quality links are built over time which improves the link popularity of the submitters’ website in the long run. Submissions should be done by those who know how the directories work, most directories are human edited. So it is easy to filter out automated submissions by use of captcha, and by submissions to the wrong categories.
Automated Directory Submissions
Websites are submitted to directories automatically in this case, automatic directory submissions service uses a script to visit directories one after the other and submit websites URL to the most relevant category. However, since many directories are human edited and uses validations such as captcha which prevent these scripts from submission, leading to massive rejections of website submissions.
So, to get quality back-links for your site and improve your site ranking; it is far preferable you chose manual directory submission services. You can learn how to do it yourself or outsource it to other people to do it for you.
BENEFIT OF SUBMITTING MANUALLY
Easy choice of format allowed by directories, e.g.
More Benefits of Manual Directory Submissions
Achieving success in a highly competitive keyword market will only be met when you are able to get back-links of your website from numerous other sites, from selected keywords of Articles in your website. With manual directory submissions you will be able to get relevant back-links from the niche directories that your site is submitted to, and since Google and other search Engines crawl these directories frequently you will get quality back links of your website in these directories; thereby obtaining a good placement in search engine page results for your site.