Your information is not wrong, but it has all already been said earlier in the thread. Please read threads before posting so that you can be sure you are contributing something different.
It Is the off page technique where you can submit your site in the directory and get approved by the directory under rules of the directory and get back link. The main thing is in the directory is relevant category .
If anyone has anything different to say about Directory submission, your post is welcome. But please read the thread first, because we don't need any more definitions which are just repeating the same thing over and over thank you.