On-Page SEO

A

• Alt text

  Alt text is the value of the `alt` attribute on an `<img>` tag. It serves two purposes: an accessibility requirement (screen readers announce it, WCAG 1.1.1 mandates it) and an SEO signal (Google treats it as anchor text for linked images and as a relevance cue in Google Images and AI Overviews).

B

• Breadcrumbs

  Breadcrumbs are the navigational trail showing a page's position in a site hierarchy (Home > Category > Subcategory > Page). When marked up with BreadcrumbList schema, Google replaces the raw URL in the SERP with the breadcrumb path — a clearer, more clickable result for users.

C

• Content brief

  A content brief is the structured pre-writing document for a single piece of content. It specifies the primary keyword, secondary keywords, search intent, target length, outline, internal links, external sources, and schema. The instrument that enforces editorial discipline at scale.

• Content gap analysis

  Content gap analysis is the process of identifying topics or keywords your competitors rank for that you don't yet cover. The output is a prioritized list of content briefs. Tooling: Ahrefs Content Gap, Semrush Topic Research, or GSC query exports cross-referenced against competitor visibility data.

• Content pruning

  Content pruning is the deliberate removal, consolidation, or noindexing of low-quality, thin, or outdated pages to lift site-wide quality signals. The counterintuitive lever: deleting pages can raise rankings on the survivors, because Panda and the helpful content system score sites in aggregate.

• Content refresh

  Content refresh is the systematic update of existing published pages — new data, new examples, expanded coverage, removed stale claims. Often higher ROI than publishing new content because the page already has age, links, and crawl history. Always update `dateModified` to signal the change.

• Content silos

  Content silos are tightly-linked clusters of content on a single topic, kept organizationally and link-wise separate from other clusters on the site. The 2010-era predecessor to the pillar-cluster model. Concentrates topical authority by giving Google an unambiguous read on what each section is about.

E

• Entity SEO

  Entity SEO is optimizing for *entities* — people, places, organizations, products, concepts — in addition to keywords. Entities are how Google's Knowledge Graph and how LLM-driven answer engines understand the world. The shift from "ranking keywords" to "being the recognized source on a topic".

• Evergreen content

  Evergreen content covers topics where search demand stays roughly stable across years. Examples: "how to write a CV", "what is HTTPS", "how to boil an egg". Distinguished from trending (one news cycle) and seasonal (annual spike). The compounding asset class of an SEO content strategy.

H

• Heading hierarchy

  Heading hierarchy is the logical nesting of H1-H6 tags in a document. One H1 per page that names the topic, H2s for major sections, H3s nested inside H2s for subsections. It signals document structure to crawlers, screen readers, and the LLM scrapers now extracting content for AI answers.

I

• Image SEO

  Image SEO is the practice of making images findable in Google Image Search, in image packs on regular SERPs, and as social-share previews — while keeping page weight low. It covers filename, alt text, dimensions, format, responsive delivery, lazy loading, and the image sitemap.

• Internal linking

  Internal linking is the practice of linking from one page on your site to another. It distributes link equity (PageRank), signals which pages you consider most important, and helps crawlers discover content. The one ranking lever you control completely — no outreach, no negotiation required.

K

• Keyword cannibalization

  Keyword cannibalization is when two or more pages on your site target the same query with overlapping intent, so Google can't decide which to rank. Ranking signals split between them and none reaches its full potential. Detected in GSC when multiple URLs alternate for one query.

M

• Meta description

  The meta description is the `<meta name="description" content="...">` tag in a page's `<head>`. Search engines use it as a candidate for the SERP snippet. Google rewrites roughly 70% of them based on the user's query. Target length: 150-160 characters, action-oriented and specific.

P

• Pillar-cluster model

  The pillar-cluster model is a content architecture: one broad "pillar" page on a topic, linked bidirectionally with many specific "cluster" pages covering subtopics. Replaces older content silos. The pattern Google's topical authority signal — and LLM grounding — most cleanly recognizes.

S

• Search intent

  Search intent is the underlying goal a user has when issuing a query — what they want to learn, find, compare, or do. The four classical types are informational, navigational, commercial, and transactional. Matching intent dominates modern ranking; exact-keyword matching does not.

• Semantic HTML

  Semantic HTML is the practice of using HTML elements that carry meaning about their content (`<article>`, `<section>`, `<nav>`, `<main>`, `<aside>`, `<header>`, `<footer>`) instead of generic `<div>` containers. Crawlers, screen readers, and LLM scrapers rely on these tags to extract structure.

T

• TF-IDF (TF-IDF)

  TF-IDF (Term Frequency - Inverse Document Frequency) is a classic information retrieval scoring formula. It ranks how important a term is in a document relative to a corpus. Modern Google ranking has moved far beyond TF-IDF into neural embeddings, but the concept persists in content optimization tools.

• Thin content

  Thin content is a page with insufficient substance to satisfy the topic it claims to cover. Typical examples: auto-generated directories, stub pages, category listings without intros, doorway pages. Google's quality filters demote or deindex them as "soft 404" or low-value rather than penalizing.

• Title tag

  The title tag (`<title>` in the HTML `<head>`) is the primary SERP headline and the browser tab text. Google rewrites roughly 60% of declared titles based on query intent. Target 50-60 characters, lead with the primary keyword, end with brand for clickthrough.

• Topical authority

  Topical authority is a search engine's assessment of how thoroughly a site covers a subject. Built through related-article depth, entity co-occurrence, consistent internal linking within a cluster, and sustained publication cadence. Stronger topical authority lifts rankings across the entire cluster.

V

• Video SEO

  Video SEO is the practice of making video content discoverable in Google's video results, the Videos tab, and on-SERP video carousels. It covers host choice (self-host vs YouTube vs both), VideoObject schema, video sitemaps, transcripts, and Google's key-moments feature.

Y

• YouTube SEO

  YouTube SEO is the practice of optimizing videos for YouTube's own search and recommendation systems — distinct from Google video Search. It covers title, description, tags, chapters, custom thumbnails, end screens, and the watch-time and engagement signals that drive YouTube's algorithms.