Domain Authority and Backlinks Are Not the Same Thing
A backlink is a hyperlink on an external website that points to your domain. It is a concrete, countable asset — one site links to another, and that link either exists or it does not. Domain Authority (DA) is a calculated score, developed by Moz, that estimates how well a domain is likely to rank in search engine results on a scale of 0 to 100. One is a raw input; the other is a derived output.
The relationship is directional: backlinks feed into Domain Authority, but DA does not create backlinks. Earning a link from a high-DA site raises your own DA over time. Earning a link from a low-DA site may add negligible score movement. DA is the scoreboard; backlinks are the plays that change the score.
How Backlinks Work as an SEO Mechanic
When site A links to site B, search engines treat that link as a signal of trust or relevance. The strength of that signal depends on the linking site's own authority, the relevance of the linking page's topic, the anchor text used, and whether the link carries a 'nofollow' or 'sponsored' attribute. A followed link from a topically relevant, high-authority domain passes more signal than a followed link from an unrelated, low-authority blog.
For ecommerce operators, backlinks typically arrive through product reviews, editorial coverage, supplier pages, affiliate partnerships, and digital PR campaigns. Each link is an independent asset that can be audited, disavowed, or built upon. Tools like Ahrefs, Semrush, and Moz's Link Explorer let operators see exactly which domains link to them, the anchor text distribution, and whether individual links are followed or not.
Backlinks are binary at the page level — a link is live or it is not — but they carry variable weight. Losing a high-authority backlink can cause a measurable drop in rankings. Gaining twenty links from low-quality directories rarely moves the needle. Volume without quality is a weak strategy.
How Domain Authority Works as a Scoring System
Domain Authority is a proprietary metric, not a Google signal. Moz calculates it by analyzing the quantity and quality of inbound links to a domain, the linking root domains count, and the overall link profile's strength relative to all other domains in Moz's index. The score is logarithmic: moving from DA 20 to DA 30 is easier than moving from DA 60 to DA 70.
DA is a comparative metric, most useful when benchmarked against direct competitors rather than read in isolation. A DA of 45 means little without knowing that your top three competitors sit at 38, 42, and 50. It provides a fast shorthand for link-building prospecting — operators typically avoid pursuing links from sites with DA below a threshold they set based on their own score and competitive landscape.
Because DA is recalculated as Moz updates its index and its algorithm, the score for a domain can shift without any change to that domain's actual link profile. This makes DA a directional indicator, not a precise measurement. Treat it as a relative gauge, not an absolute target.
Where They Overlap and Where They Diverge
Both backlinks and Domain Authority are used to evaluate the health and competitive strength of a domain in organic search. Both matter for link-building prospecting: when deciding whether to pursue a link placement, operators check the DA of the target site and the quality of its existing backlink profile simultaneously. In this context they are complementary data points, not alternatives.
They diverge sharply in actionability. A backlink is something an operator can actively acquire, monitor, and lose. DA is a lagging score that reflects historical link-building activity across the entire domain. You cannot directly increase DA — you increase it indirectly by earning more high-quality backlinks. Conversely, a single strong backlink from a high-DA domain can deliver ranking improvements even before DA itself updates.
They also diverge in granularity. Backlinks exist at the page level — a link points to a specific URL. DA exists at the domain level only. If an ecommerce product page earns twenty strong backlinks, those links benefit that page and contribute to domain-level DA, but DA does not tell you which pages are driving the score.
When to Focus on Backlinks vs. Domain Authority
Use backlinks as the primary operational focus when running active SEO campaigns. Count linking root domains, audit anchor text distribution, identify toxic links for disavowal, and set monthly acquisition targets. Backlinks are the lever; they respond to deliberate outreach, content creation, and digital PR. Track them in real time through your preferred crawl tool.
Use Domain Authority as a benchmarking and prospecting tool. Before pitching a guest post, review the target site's DA relative to your own. When evaluating a competitor's SEO strength before entering a new product category, DA gives a fast read on how much link equity they have accumulated. When reporting SEO progress to stakeholders quarterly, DA movement summarizes months of link-building work in a single number.
For ecommerce stores specifically: prioritize building backlinks to category pages and high-margin product pages, since those pages convert. DA will rise as a downstream consequence of consistent link acquisition. Do not set DA as a campaign goal — set linking root domain targets and quality thresholds instead.