Today, I will discuss link building techniques in SEO. There are two types of link building techniques used, namely, Black Hat SEO and White Hat SEO. Black Hat SEO means using excessive amounts of keywords in the title tag and meta description, over optimization of website content and building spammy backlinks to the website. Google and other search engines allow backlinks made from white hat techniques and they penalize the websites that use Black Hat SEO techniques. Various updates have been launched by google like google panda, google penguin, etc. But there are still some SEO companies that use Black hat SEO techniques to quickly enhance their rankings on google and other search engines. But I personally recommend that if you want to avoid google penalties and suspension of your website account, make sure that you use white-hat SEO techniques.