Links from other websites that point to any particular page on your site. Search engines use backlinks to judge a site’s credibility; if a site links to you, the reasoning goes, it is vouching for your authority on a particular subject. Therefore, Link Building is an incredibly important part of Search Engine Optimization. How many links, the quality of the sites linking to you, and how they link to you all are important factors, and the continued growth of the number and quality of these links is hugely impactful on rankings. Also called Inbound Links.