Does inbound links really helps to come in ranking?

Link Building is very famous and most important part of SEO, Search Engine optimization process. All web site owners who want to get top their web sites, pays for SEO to come in top ranking on major search engine ranking page. Many more search engine optimization services provider companies have added Directory Submission and Link Exchange process in their SEO Services menu.

Link building and link exchanger is a process which is very famous to get top ranking, here most of website owners are looking for one way link exchange, means get inbound links from other related site, without giving him back links, as some are getting paid links, it’s not as hard as free one way link. But how one way linking is effective is possible for top ranking in search engines? I think all inbound links will not be counted by search engines as back link. Than what is benefits of that link which has not been counted by search engine? Actually I have read many more time on web and specially in forums about one way link or back links from directory submission, but if this is very effective, than why we need to work on other seo activities like forum posting, bookmarking article submission.

source:- semaphore-software.com/