what is the requirement of reciprocal link URL in directory submissions?

[hudsonclark072]

In order to make myself from expert at handling SEO, I have started to do submissions on my own. the usage of a reciprocal link URL in the submission directories is not understandable to me. If you want to validate the reciprocal link it includes the HTML code in the page at the particular URL. This is something that many directories have said. This all is guessed to happen before while the forum is submitted. What is the reason behind the requirement for this? Is anyone there who can give me suggestions in this matter? Is there any need for these things?

[Kewinpot]

What's the purpose of submitting directories? If we submit directories, we get back links and if we get back links, our ranking position will increase. For that only we are doing this. Like wise, if we put the reciprocal link of any others site in our site, he will also get those benefits. For that only, most of the sites are doing like that.