There are 3 types of directory submission - 1. Free 2. Reciprocal 3. Paid.
1. Free : You can submit your url at free and the webmaster or editor will manually check and it takes time minmum 3 months and some websites approve it same day or takes one month time, depends on directory policy.
2. Reciprocal : In this process, we submit our url into the website and auto generated url of the website, we keep into our website to give the link back to the website.
3. Paid : In this activity, we submit our url into the directory and pay some money to the website to make our submission approve.