Definition

Domain authority (DA) is a score, usually 0 to 100, that estimates a site’s ability to rank in search results. It is not an official Google metric. The best-known scores are DA (Moz), Domain Rating (Ahrefs), Authority Score (Semrush), Trust Flow (Majestic).

What it is based on

• Quantity and quality of inbound backlinks
• Diversity of referring domains
• Profile and topic of linking sites
• Age and stability of the domain

Why it helps (and its limits)

Domain authority is a proxy to compare the SEO power of several sites: a tool for benchmarking, partnership prospecting and backlink evaluation. But it does not measure content quality, user experience or EEAT signals. A DA 70 site may rank worse than a DA 35 site that is better optimized for a specific query.

How to improve it

• Earn high-quality editorial backlinks (press, partnerships, mentions)
• Strengthen EEAT and overall site trust
• Build a sustainable content strategy (solid internal linking)