Directory submission is the process of submitting your websites to directory sites which classifies information and adds your link to the relevant category.
What is Directory Submission in SEO?
Directory submission in Search Engine Optimization(SEO), is one of the off page SEO activity , for this you need to select best directory or directory information listing sites to submit your website information.
Such as, Website Name, URL and Description of website.
If you keep doing this regularly your page rank will increase and helps you to get more traffic from google search engine, this link building will increase your domain authority and page rank in Google. for more SEO tips and tricks check these reference links.
List of High PR Directory Submission Sites: