Back links show the popularity or importance of your website and is reflected in Google popularity of that page as well as search rankings. Links are considered as recommendations or votes by other sites in your favor. This means the more you have back links, the more popular your website is. Back links are also referred as inbound links, in-links, incoming links and inward links. Back links are essential for search engine rankings. Some search engines, like Google, gives importance to those websites that have greater number of back links and thus consider them more worthy of top rankings in comparison to others.