Good page rank from seo service

Outbound Link is a link from your website to another site or page. Usually it sucks your web-site page rank

But then most visited sites started putting this tag, and as a consequence, while many people link to them and give away their PageRanks, these sites do not give any PR in return.

Back is a link to your site from another website. Incoming links, inbound links, in links, and inward links are all different names for the same thing.

Keywords are word(s) or phrase(s) a person types into a search box.

Index is a search site's database consisting of all web-sites that it had crawled.