Links can be classified into 2 types - inbound links and outbound links. Inbound links, also known as backlinks come from an external site to your website. Outbound links are the links on your website pages which lead to an external website. Inbound links are of great significance for search engine optimization processes. Link building is important for website optimization because search engines give more credit to websites with large number of quality incoming links.

The important factors which help to identify a good link campaign are: trusted websites, relevance of content from which it is being linked and diversity of all the incoming links. It is difficult to get a link to your website, imbibed with all these qualities, but you can get a link with one or two of these qualities.

It is essential that the websites which provide inbound links to your website are trustworthy. A concept called TrustRank helps to identify the worth of a website. Some websites are less trusted and categorized as low quality websites. You can determine if a website is trusted or not by referring to the seedset of trusted websites provided by TrustRank.

The second important component for SEO links is relevance. It is not the relevance of the website that you are getting your link from but the relevance of the anchor text and the text surrounding it. Link building for relevance using anchor text is not a run-of-the-mill task. The words used in anchor text can affect the ranking of your website, because a search engine can get an idea of what is on the other end of the link before crawling it.

Getting links from different domains rather than the same domain will help build a good link profile. You can get numerous links from the same domain but relevancy cannot be compromised, in order to get different anchor text and links to different pages. However, link diversity adds more value to link building. Getting links from the same domain is similar to getting votes from one person. Winning votes from many people is important; likewise, getting links from varied domains will prove more effective.

These are the factors which will help you create quality links to your website. If one builds links by paying heed to the above mentioned factors, the link building campaign will be better placed to improve rankings.