I hope that you know that there are "dofollow" and "nofollow" links.
Some people use "nofollow" links for website's better promotion.
There are many reasons you would want to use the “nofollow” tag, such as:
1) Paid Links: This is recommended by Google. Essentially, your sites page rank give a small amount of rank juice to the sites you link to (which helps their search engine ranking, which is the purpose of link building, to get that juice from others). If you have a paid link on your site, it’s essentially buying a higher rank in Google. They don’t like that.
2) Maybe in your blog’s comment section (if using most blog software, this is automatic). It is up to you if you want your commentators to get link juice back to their site. It is personal preference.
3) When linking to major, very popular sites. If you are linking to google.com, yahoo.com, digg.com (the front page), cnn.com, or whoever else, they are already popular, so you might as well use “nofollow” since your link won’t make or break them.
I hope this has been helpful.
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