A backlink is a hyperlink from one website to another. It is commonly understood as a reference or vote of trust from one page to another page on the internet.
Introduction
Backlinks are links from one website to another. They're one of the key signals used in search engine ranking systems.
This guide explains what backlinks are, why they exist, how they work, and how they connect to the practice of link building.
What Is a Backlink?
A backlink is a link from one website to another, also called an inbound link or incoming link.
Backlinks are typically interpreted as signals of reference, trust, or recommendation between pages.
Example: A backlink from a major publication (e.g., The New York Times) to a research study signals that the study is credible and worth referencing. A backlink from a popular tech blog to a startup's product page signals relevance within that industry.
Simple definition: A backlink is a link on someone else's website that points to yours.
Why Backlinks Exist
Backlinks exist because websites naturally do a few things:
- Reference useful or relevant content. A food blog links to the nutrition study it's citing.
- Cite sources or data. A news article links to the original research report.
- Recommend tools, products, or resources. A software review site links to the product being reviewed.
- Mention other websites in editorial content. A roundup post links to multiple companies or creators.
In practice, backlinks work like references in the real world. They're how the web connects ideas, sources, and pages to one another.
How Backlinks Work
Search engines use backlinks as signals of trust and authority.
When one page links to another, it can pass signals of credibility to the destination page. This helps search engines understand:
- Which pages are worth discovering
- Which pages are considered useful or trustworthy by others
- How pages relate to one another across the web
The more relevant and trustworthy the linking source, the stronger the signal tends to be. A backlink from a respected industry publication carries more weight than a link from an unrelated or low-quality site.
Types of Backlinks
Backlinks can be grouped into common types:
- Editorial backlink. A link placed naturally within content due to relevance or usefulness.
- Guest post backlink. A link earned through an article contributed to another website.
- Directory link. A listing in a curated directory or resource page.
- Social backlink. A link shared from a social platform (e.g., LinkedIn, Reddit, Twitter/X).
- Nofollow link. A link that signals limited SEO value transfer to search engines.
- Dofollow link. A standard link that can pass SEO value between pages.
Most sites accumulate a mix of these over time. Not all of them carry equal weight.
What Makes a Backlink Valuable?
The value of a backlink comes down to a few key factors:
- Relevance. How closely related is the linking site to the topic? A backlink to a cybersecurity company from a tech publication is more relevant than one from a cooking blog.
- Authority. How trusted or established is the linking domain? Links from sites like Forbes, Wikipedia, or government sources tend to carry more weight.
- Placement. Is the link in the main body of the content, or buried in a footer or sidebar? Links within the primary content area are generally considered more valuable.
- Naturalness. Does the link appear editorial and genuine, or artificially placed? Search engines are built to tell the difference.
One-line summary: A valuable backlink comes from a relevant, trusted source and appears naturally within real content.
Why Backlinks Matter for SEO
Backlinks can do a few meaningful things for a page:
- Help search engines discover pages that might otherwise go unnoticed
- Contribute to perceived trust and authority for a domain or page
- Influence search rankings (pages with more high-quality backlinks tend to rank higher)
- Generate referral traffic from users who follow links directly, independent of search
Example: When Wired published a feature linking to several AI tools in 2024, those tools saw measurable spikes in both referral traffic and search visibility. One set of backlinks, two simultaneous benefits.
How Backlinks Connect to Link Building
Backlinks don't typically appear automatically for most websites.
For new sites, niche sites, or businesses in competitive markets, backlinks usually need to be actively earned. That happens through creating content others want to reference, building relationships with publishers, or pursuing coverage through digital PR.
This practice is known as link building. A backlink is the outcome. Link building is how you work toward getting one.
What Is Link Building?
Link building is the process of acquiring backlinks from other websites.
It involves creating content or relationships that lead to external references, so that other websites naturally link to yours, or are persuaded to through direct outreach.
Understanding backlinks is the first step. The next step is building a strategy around them.
Want to build backlinks that actually improve rankings? We work with brands at LinkyJuice to create scalable, high-quality link building systems. Book a quick call and we’ll map out your best opportunities.
