Back links are of three types:

One way links

Two way or Reciprocal Links

Paid Links

Among the three obviously one way links are best for the optimization of a site.

Ways to get One Way Links:

1. Submission to free Directories

One way free links could be get through free Submission into directories that allow one way link submission. Links need to be added only in the relevant categories. Few directories submit link immediately. But most of the directories go for manual review of the site that whether they are relevant to the category stated or not and after review they approve or reject the website.

The duration of the review may range from one week to several months and it normally differs for one directory to another.

High Quality website or directories provide one way links through paid submissions.

2. Social Book-marking Sites

Social Book-marking sites are also known as social networking sites. Registered users can store the links to the web pages that they find useful. They can access the links from anywhere anytime by logging into their account. The links are accessible to other users also in the network and to the public even. Thereby these links help in search engine optimization for the sites also. Other people with similar interests can view the links by category, tags, or even randomly. Some allow for privacy on a per-bookmark basis.

Most social book marking services allow users to search for bookmarks which are associated with given "tags", and rank the resources by the number of users which have bookmarked them. This helps in drawing a lot of potential traffic to the site.

Social Book marking sites are one of the best sources of getting one way free links to the web pages.

3. Blog Submission

Blog is a web site, where you write stuff on an ongoing basis. New stuff shows up at the top, so your visitors can read what's new. Then they comment on it or link to it or email you. We can use blogs to let people know about our website. Blogs solves the similar purpose as articles do and are very popular among internet searchers and thus can bring good amount of traffic.

There are a number of blog sites where one can post his blog. And for SEO one can include a link in the blog to direct a visitor to the blog to the web page.

4. Article Submission

Article is posted basically to provide information to the readers. One can provide useful information to the readers usually relevant to the theme of the web site and then tempt the readers to refer the website for more relevant information by providing the link to the web page in the article. A number of good article directories are available where one can post his article for free. Ezinearticles, Article City, etc. are few of them.

Articles have also proved to be a very meaningful resource for getting one way link. With the help of articles a Website owner can draw a good amount of potential visitors to the site.

5. RSS Submission

RSS means Really Simple Syndication. RSS is a group of web feeds used to publish frequently updated content such as blog entries, news headlines, announcements, launch of a new product. An RSS document, which is called a "feed", "web feed", or "channel", contains either a summary of content from an associated web site or the full text. There we can include links to the web site pages for which we want to get one way links.

RSS makes it possible for people to keep up with their favorite web sites in an automated manner which is easier than checking them manually.

The user subscribes to a feed by entering the feed's link into the reader or by clicking an RSS icon in a browser that initiates the subscription process. The reader checks the user's subscribed feeds regularly for new content, downloading any updates that it finds.

6. Press Release submission

A Press Release or press statement is a recorded statement for making announcements.

With the help of press releases one can provide important announcements regarding the web site's information such as launch of new products, services, or news conferences, events, etc.

These press releases could be submitted in Press Release Sites with the link to the web page. Thereby through press release submission also one can get valuable one way links.