There are 2 types of links associated with your website. "Outbound Links" are the ones where there is a link on your website that links to another website. "Inbound Links" are the ones where another website links to your website.

To give your website the most advantage with the search engines, you want as many "Inbound" links as possible because each inbound link is seen as a "vote" of confidence for your website. There are many link building strategies you can use, but one simple one is to ask all of the companies you do business with to place a link on their website to yours.

You can reciprocate with them by placing a link to them on your site.