Top-Level Domain (TLD)

The extension at the end of a domain name — .com, .org, .io, .co — representing the highest level of the domain hierarchy. While Google says TLDs don't directly affect rankings, users tend to trust familiar extensions like .com.

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Related Terms

Taxonomy SEO

Structuring your website's content into logical categories, tags, and hierarchies so search engines and users can navigate topics intuitively. Well-executed taxonomy SEO strengthens internal linking and helps pages inherit topical authority from their parent categories.

Technical SEO

Optimizing your site's backend infrastructure — crawlability, indexing, page speed, security, structured data, and rendering — so search engines can access, understand, and rank your content without friction.

TF-IDF

A statistical method that scores how important a word is to a page relative to a larger collection of documents. Content optimization tools use TF-IDF analysis to identify terms competitors cover that your page is missing.

Thin Content

Pages that deliver little or no unique value to visitors — such as auto-generated pages, shallow articles, or scraped content. Google's Panda algorithm was specifically designed to suppress thin content in search results.

Tiered Link Building

A strategy where you build backlinks not only to your target pages but also to the pages that link to you, amplifying the link equity that flows to your site. The quality of each tier determines whether this approach helps or hurts.

Title Tag

The HTML element that sets a page's title, shown in browser tabs and as the clickable blue headline in search results. Writing specific, keyword-rich title tags is one of the highest-impact on-page SEO actions you can take.