On the Internet, many directories contain links to other network resources grouped by topics. The process of adding your site information to them is called submission.
Adding your website to these directories will not drive visitors to your webdsite; however, search engines count links from these directories and this may enhance your sites search result placement, which should improve the number of visitors.
You should not submit your site to FFA (free-for-all) directories. Such directories automatically publish links related to any search topic and are ignored by search engines. The only thing an FFA directory entry will give you is an increase in spam sent to your published e-mail address. Actually, this is the main purpose of FFA directories.