Backlinks: A backlink, also known as an inbound link, is a link from one website to another. They play a significant role in search engine optimization (SEO) as they can improve a website's search engine ranking and visibility. Search engines like Google consider backlinks as a vote of confidence in a site's credibility, relevance, and content quality. High-quality backlinks from reputable websites lead to better SEO and more organic traffic. However, spammy or low-quality backlinks can hurt your site's ranking or even lead to penalties.