Link building is an essential part of a successful seo campaign. Link building is the process of getting quality websites to link to your website.
These links are called inbound links, backlinks or hyperlinks and are very important for the success of your seo campaign. Search Engines consider these links as votes to your site.
So the more inbound links my sites has the better ranked it will be?
No. Because what matters here is relevancy, it is important to have inbound links in sites relevant to the main subject of your website. Authority is another criteria that Search Engines use to determine the quality of an inbound link.
It is also very important to use the right keywords or keyphrases in the anchor text of these hyperlinks. The anchor text is the clickable text in a hyperlink. Anchor text is weighted highly by the search engines, that is why is so important to use your target keywords/keyphrases on them.