Search Engine and Directory are different about the method of receive the data of (url). The Search engine will find your site by its bot or crawler. It is automatic and machine based. In the other side, directory receives sites data by submission action. So you need an action to submit your site data because it is manual based.
Submit your site to directories and search engines can make your site popular and improve your rank position on search engine results list.
You can submit your site of the following directories and search engine: