Directory submission is a process of submitting your website's URL and other relevant information to online directories in order to get backlinks and improve your website's visibility and search engine ranking. Backlinks are important because they are essentially like votes from other websites, telling search engines that your website is valuable and relevant. The more backlinks you have, the higher your website will rank in search engine results pages. Directory submission can be a tedious and time-consuming process, but it's worth it in the long run. Not only will it help improve your website's ranking, but it will also help drive traffic to your website.