SEO Glossary
30+ essential SEO terms explained clearly — from anchor text and backlinks to Domain Rating, spam score, E-E-A-T, and beyond.
Maintained by Muhammad Subhan · Updated June 2026
A
Anchor Text
The clickable, visible text of a hyperlink. Google uses anchor text as a relevance signal to understand what the linked page is about. Over-optimising exact match anchor text can trigger algorithmic penalties.
Algorithmic Penalty
A ranking drop caused by a Google algorithm update rather than a manual reviewer. Google's Penguin algorithm targets manipulative link building; Panda targets thin or low-quality content.
B
Backlink
A hyperlink from one website pointing to another. Backlinks are one of Google's top three ranking factors. High-quality backlinks from authoritative, niche-relevant sites pass authority (link equity) to the target page.
Black Hat SEO
SEO practices that violate search engine guidelines, such as buying links, using PBNs, or cloaking content. Black hat tactics may produce short-term gains but carry significant penalty risk.
C
Crawl
The process by which Google's bots (Googlebot) discover and analyse web pages. Pages must be crawled before they can be indexed. A sitemap.xml file helps Googlebot discover all pages on your site.
Canonical Tag
An HTML tag that tells search engines which version of a page is the "master" version, used to prevent duplicate content issues. Canonical tags are important for sites with similar or paginated content.
D
Domain Rating (DR)
A metric created by Ahrefs that measures the strength of a website's backlink profile on a scale of 0–100. DR is logarithmic — moving from DR 60 to DR 70 requires significantly more link equity than moving from DR 20 to DR 30.
Domain Authority (DA)
A metric created by Moz that predicts how likely a website is to rank in search engines, scored 0–100. DA is calculated using Moz's link index and is commonly used alongside DR when evaluating publisher quality.
Dofollow Link
A hyperlink that passes link equity (authority) from the linking site to the target site. Dofollow links are the standard link type and are what link building campaigns focus on acquiring.
Disavow
A Google tool that allows website owners to request that certain backlinks be ignored when evaluating their site. Used to remove the negative impact of toxic, spammy, or manipulative backlinks.
E
E-E-A-T
Experience, Expertise, Authoritativeness, and Trustworthiness — Google's framework for evaluating content quality. E-E-A-T is especially important for YMYL (Your Money or Your Life) topics like finance, health, and legal content.
G
Guest Posting
The practice of writing and publishing an article on another website, typically in exchange for a backlink to your own site. Guest posting on high-DR, niche-relevant sites is one of the most effective white-hat link building strategies.
GBOB
Guest Blogging Outreach Business — a business model where an operator builds a network of publisher relationships and manages link placement campaigns on behalf of multiple clients simultaneously.
I
Index
Google's database of web pages it has crawled and stored. A page must be indexed to appear in search results. New pages and backlinks can be submitted to Google Search Console to request faster indexing.
L
Link Equity
Also called "link juice" — the authority and ranking power passed from one page to another through a hyperlink. Link equity is influenced by the linking page's authority, its relevance, and how many other links it contains.
Link Velocity
The rate at which a website acquires new backlinks over time. An unnatural spike in link velocity — such as acquiring 200 links in one week after months of zero activity — can appear manipulative to Google.
Link Profile
The complete collection of backlinks pointing to a website. A healthy link profile features diverse anchor text, links from multiple unique domains, and a mix of authority levels.
M
Manual Action
A penalty applied by a human reviewer at Google when a site is found to violate Google's Webmaster Guidelines. Manual actions can cause significant ranking drops or complete de-indexing.
N
Nofollow Link
A hyperlink with a rel="nofollow" attribute that instructs search engines not to pass link equity. Nofollow links do not directly improve DR/DA but can still drive referral traffic.
Niche Edit
Also called a link insertion — adding a backlink into an existing, already-published article on another website. Niche edits can be faster to obtain than guest posts and often come from pages with existing traffic and authority.
O
Organic Traffic
Website visitors who arrive through unpaid search engine results. Organic traffic is the primary goal of SEO — high-quality backlinks improve rankings, which drives more organic visitors to your site.
On-Page SEO
Optimisation of elements within your own website — including title tags, meta descriptions, heading structure, content quality, and internal linking — to improve search rankings.
Off-Page SEO
SEO activities that happen outside your own website, primarily link building and brand mentions. Off-page SEO signals — especially backlinks — are among the strongest ranking factors Google uses.
P
PBN (Private Blog Network)
A network of websites created specifically to build backlinks to a target site. PBNs violate Google's guidelines and can result in manual penalties. Backlink Bridge never uses PBNs.
PageRank
Google's original algorithm for ranking web pages, based on the number and quality of links pointing to a page. While Google no longer publicly reports PageRank scores, the underlying principles still power modern link evaluation.
R
Root Domain
The primary domain of a website (e.g., backlinkbridge.com). SEO tools measure "referring domains" — the number of unique root domains linking to a site — as a key authority metric.
Referring Domain
A unique website that links to your site at least once. Having 100 links from 100 different domains is far more valuable than 100 links from a single domain.
S
Spam Score
A metric by Moz that predicts the percentage of sites with similar features that have been penalised by Google. A high spam score (above 10%) indicates a risky backlink profile. Backlink Bridge targets publishers with spam scores under 3%.
SERP
Search Engine Results Page — the page displayed by Google or other search engines in response to a query. Ranking on page one of the SERP for your target keywords is the primary objective of SEO.
W
White Hat SEO
SEO practices that comply with search engine guidelines. White hat link building focuses on earning genuine, editorial backlinks through quality content and manual outreach.
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