Backlink types are often distinguished by their placement location, link origin, and the HTML attributes used. Examples include contextual backlinks, comment links, profile links, social bookmarks, blogrolls, document or image links, social media backlinks, footer links, and follow and nofollow links. However, some popular terms—such as link juice and linking root domain—are actually more accurately described as concepts or metrics, rather than standalone link types.
This article reviews 11 backlink categories and terms, along with examples of their use, risks, and how to assess quality. Before proceeding, first understand the definition of a backlink and how it works and the function of an inbound link for a more accurate link audit.
How to Group Backlinks Correctly
There are three important dimensions: origin and position (e.g., article content or footer), purpose and context (how relevant it is to the reader’s needs), and link attributes (normal, nofollow, sponsored, or UGC). Labels like “forum backlink” don’t automatically indicate whether a link is useful or part of a spam scheme.
Google confirms that links can help crawlers discover URLs and are a relevancy signal. However, there is no public formula that guarantees that certain types of links will boost rankings. The principle of non-manipulative SEO is more important than choosing techniques based on jargon.
11 Types of Backlinks and Terms You Need to Know
1. Contextual Backlinks
Contextual backlinks are located within paragraphs that discuss related topics. For example, technology media might cite email security guidelines written by another organization and link to them as a source. This kind of context can help readers find evidence or further information, but links should be editorially selected, not purchased for anchor keywords.
When examining contextual links, pay attention to the appropriateness of the content and anchor text. Avoid overly forced anchors. To understand the practice, use guide to getting quality backlinks as an outreach framework.
2. Blog Comment Backlinks
Links in the comment section are links left by visitors to other people’s websites. Comments that contribute to a discussion may drive traffic, but mass comments with commercial anchors are an example of link spam. Google recommends rel="ugc" or other appropriate qualifiers for user content links.
A safe example: a developer answers a WordPress plugin question with a complete solution, then includes related documentation if permitted by moderators. Not: copying a short comment into hundreds of articles just to get a link.
3. Link Profile Backlink
A profile link is a website URL listed on a company profile, association membership, or service account. For example, the Bloggerpi Digital’s LinkedIn profile is the official channel’s identity; such links are more likely to be considered navigation and brand verification, rather than a ranking manipulation tool. Platforms can use the nofollow or redirect attribute.
For eligible businesses, Google Business Profile helps present contact and website information with local context.
4. Social Bookmark Backlink
Social bookmarking or link curation collects community-curated sources. When used organically, this can direct readers to research or tutorials. However, bulk bookmarking services that accept thousands of links without editorial quality risk being useless and can approach link spam patterns.
Example: developer communities maintain technical guides that actually help troubleshoot problems. Measure referral visitors and engagement, not bookmark numbers.
5. Blogroll Backlink
A blogroll is a list of recommended sites that traditionally appear in a sidebar or links page. On a personal site, a blogroll can reflect real-world relationships between blogs. However, massive link exchanges spread across multiple pages to deceive search engines should be avoided.
Example: A travel blogger includes a resource page for maps or documentation of a region that readers regularly use; such a list needs to be curated and updated to remain relevant.
6. Document or Image Sharing Backlinks
Links from PDF documents, presentation materials, or image sharing pages can direct readers to the original source. Crawling effectiveness depends on format and access, and not all embed or share URLs behave like normal HTML links.
Example: A webinar organizer provides a licensed handout citing an official report along with the source URL. Ensure copyright, attribution, and the landing page remain relevant to the content being shared. The quality of the reference is more important than the number of posts.
7. Social Media Backlinks
Links in social media profiles or posts can send referral traffic and brand awareness. However, link sharing is not a direct ranking signal. Social media backlinks often go through redirect systems, specific attributes, or UIs that are not equivalent to editorial links from public articles.
Use influencer collaborations for awareness or audience purposes when appropriate, rather than promising specific rankings based solely on shares.
8. Footer Backlinks
Footer links appear at the bottom of the page and are often repeated across multiple URLs. Reasonable link credit is not the same as a mass footer link network for commercial keywords. Google identifies the spread of low-quality footer/template links in link spam schemes.
Example: “Developed by” links on client sites that are transparently agreed upon should consider the commercial relationship; don’t require links that pass ranking credit as a hidden contractual condition.
9. Link Juice or Passing Link Equity
Link juice is an informal term to describe the idea that links can convey certain signals through the web structure. This is not a type of backlink and cannot be directly measured with a single number provided by Google. Avoid definitive claims that a single backlink sends a certain amount of “juice.”
This discussion relates to the history of PageRank and the practice of internal linking, which helps users reach important pages. Do not use this term to justify buying links.
10. Linking Root Domain
Linking root domain refers to the unique domain that links to your website in some analytics tools. If a single domain links to 100 of your pages, the link count and referring domain count will be different. However, “referring domain” is a way of categorizing sources, not a technical link type.
When evaluating, note relevant originating domains and source variations, but don’t assume one new domain is always better than multiple genuinely helpful references from the same domain.
11. Follow, Nofollow, Sponsored, and UGC
Normal links don’t need rel="dofollow"; “dofollow” is just a general SEO term. rel="nofollow" is used when you don’t want to fully endorse a particular link; rel="sponsored" identifies advertising and paid placements; rel="ugc" identifies user content such as forums/comments.
HTML example: <a href="https://contoh.com" rel="sponsored">Mitra berbayar</a>. This attribute describes the link relationship, not guarantees that the link will not be visited. Refer to Google link attribute documentation for the exact rules.
A Brief Comparison of Benefits and Risks
| Category | Key benefits | Risk notes |
|---|---|---|
| Contextual editorial | Informative referrals and relevant visits | Must be completely contextual |
| Comment/forum | Discussion and referral | Comment spam / manipulative anchors |
| Profiles and directories | Business identity and navigation | Business profiles without value |
| Bookmarking/social media | Distribution and Awareness | Doesn’t automatically increase ranking |
| Blogroll/footer | Navigation and references | Sitewide link scheme |
| Documents/images | Attribution and source of material | Copyright and indexability |
| Link juice/root domains | Concept and analysis methods | Not a standalone backlink category |
| Follow/nofollow/sponsored/ugc | Link relationship qualifications | Disclosure errors or rel |
How to Choose Good Backlinks?
Start with the quality of the site and the benefits it offers to readers. Audit the linking page, not just the domain score. Prioritize topic relevance, editorial independence, sponsor transparency, page access, and truly reasonable traffic. Understanding off-page SEO principles helps distinguish reputation-based activities from link manipulation.
Align with content credibility and content that has unique value. Content full of keywords without concrete information still doesn’t make a good reference, even if it gets a lot of references.
Checklist before outreach
- Does the potential source site cover a relevant topic?
- Is the destination article accurate and updated if data changes?
- Is the link placement helpful to users, not hidden payment terms?
- Is
nofollow,sponsored, orugcrequired? - Is there any referral, conversion, or interaction data that can be reasonably measured?
Consider the website’s technical requirements so that the page receiving the link is easily accessible, and SEO performance measurement to read the results without attributing all ranking changes to backlinks alone. Use search factors overview for context.
For applicable strategies, see 7 link building methods and examples of off-page activities; and compare them with approaches to increasing traffic that also consider other channels. Learn about digital PR as a path to building long-term relationships.
Frequently Asked Questions (FAQ)
What are the most common types of backlinks?
These include contextual, comment, profile, social bookmark, blogroll, document/image links, social media, footer, and variations of follow and nofollow attributes.
Are contextual backlinks always best?
Not automatically. Relevance, editorial value, source quality, and reader value still determine the context.
Are social media profile links backlinks?
They can be referral links to a website, but their technical nature, redirects, and link attributes vary across platforms and do not guarantee rankings.
Are blog comment backlinks safe?
Relevant discussions can be helpful, but mass commenting with keyword links is a risky practice. Follow forum rules and use UGC attributes as needed.
What is link juice?
An informal term for the idea of signal transmission through links; not a type of backlink or a precise number from Google.
What is a linking root domain?
The unique domain from which a link originates; this is a source-grouping metric, not a backlink attribute.
What is the difference between follow and nofollow?
Follow is a general term for a normal link; nofollow is a rel attribute that qualifies link relationships for crawlers.
When to use rel sponsored?
Use it on advertising links or paid placements to make the commercial relationship clear to search engines.
Can footer backlinks be harmful?
Regular footer links aren’t automatically problematic, but mass placement with manipulative keywords can be considered link spam.
Do a large number of referring domains guarantee rankings?
No. The relevance and quality of context are more important than simply increasing the number of referring domains.
How do you monitor the types of incoming backlinks?
Audit sources and anchors using available tools, check referral traffic, and distinguish editorial links from sponsored relationships or UGC.
External References
- Google Search Central — Link best practices
- Google Search Central — Qualify outbound links
- Google Search Central — Spam policies
- Google Search Central — SEO Starter Guide
- LinkedIn — Bloggerpi Digital (original article link)
