DA backlinks are links to your website from other reputable sites with high Domain Authority (DA). Domain Authority is an SEO ranking score developed by Moz to predict how likely a domain is to rank in search engine results pages (SERPs)
You Can Increase Keyword Rank Without Any Link Building
Put simply: yes you can rank a site better for specific terms without links though if the site is in a moderately competitive to competitive niche it won't stay there long without them.