Glossary: SEO

25 terms

Answer Engine Optimization / アンサーエンジン最適化

Optimization for 'answer engines' — AI search and voice search that return direct answers. Core tactics include question-format content, FAQ structured data, and concise definition-first writing.

SEO3

AI Mode

Google AI Mode / AIモード

A new Google Search mode that decomposes queries via Query Fan-out and applies Deep Search to deliver deeper, synthesized answers. Started rolling out in the US in 2025.

SEO4

AI Overviews

AIによる概要 / Google AI Overviews

Google's AI-generated summary panel that appears above standard search results, grounded on the regular search ranking pipeline via RAG to deliver synthesized answers to complex queries.

SEO3

BreadcrumbList

BreadcrumbList schema / パンくずリスト構造化データ

A Schema.org type for breadcrumb navigation. Implemented via JSON-LD, it surfaces site hierarchy in Google search results, improving click-through rates and helping search engines understand site structure.

SEO3

Core Web Vitals

CWV / コアウェブバイタル

Google's three core page experience metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift). All three are confirmed Google ranking signals.

SEO3

Deep Search

ディープサーチ / 深層検索

Google AI Mode's deep-research capability that scrutinizes and synthesizes numerous pages for each sub-query generated by Query Fan-out, delivering research-grade answers beyond standard search.

SEO3

DefinedTerm

DefinedTerm schema / 定義語構造化データ

A Schema.org type for defined terms. Applying it to glossary pages or definition-heavy content makes it easier for AI Overviews and AI Mode to accurately cite the definition.

SEO4

E-E-A-T

Experience Expertise Authoritativeness Trustworthiness / 経験・専門性・権威性・信頼性

Google's four-factor quality framework: Experience, Expertise, Authoritativeness, and Trustworthiness. It guides both human quality raters and informs how Google's ranking systems assess content credibility.

SEO3

FAQPage

FAQPage schema / FAQページ構造化データ / よくある質問マークアップ

A Schema.org type for FAQ pages, implemented via JSON-LD. It enables expandable Q&A rich results in SERPs and increases the probability of being cited in Featured Snippets and AI Overviews.

SEO3

Featured Snippet

フィーチャードスニペット / 強調スニペット / Position Zero

A highlighted excerpt box shown above organic results that directly answers a query via paragraph, list, or table. Often considered a precursor to AI Overviews in surfacing direct answers.

SEO3

GEO (Generative Engine Optimization)

Generative Engine Optimization / 生成エンジン最適化

Optimization techniques aimed at maximizing citation and visibility in AI-generative search engines such as AI Overviews, Perplexity, and ChatGPT Search — a concept that emerged alongside LLMO after 2024.

SEO3

Google Business Profile

GBP / Googleビジネスプロフィール / 旧Google マイビジネス

Google's free tool for managing business information shown in Google Search and Maps. Optimizing it is one of the most impactful local SEO tactics. Formerly called Google My Business.

SEO3

Google-Extended

Google-Extended クローラー / Googleの学習クローラー

Google's dedicated AI training crawler. By specifying 'User-agent: Google-Extended' in robots.txt, site owners can opt out of having their content used to train Gemini and Vertex AI models.

SEO4

Helpful Content

Helpful Content Update / HCU / ヘルプフルコンテンツ

A Google algorithm principle introduced in 2022 that rewards genuinely helpful, people-first content and demotes content created primarily to capture search traffic, including low-quality AI-generated or scaled content.

SEO4

JSON-LD

JSON for Linked Data / 構造化データスクリプト

A method of encoding Schema.org vocabulary as JSON, embedded in HTML via a script tag with type='application/ld+json'. It adds structured data without touching the visible page markup.

SEO5

LLMO (LLM Optimization)

LLM Optimization / LLM最適化 / Large Language Model Optimization

A collective term — popularized in Japan's SEO community — for content and technical optimizations that increase citation probability in LLM-based AI search and AI assistants. Closely overlaps with GEO and AEO.

SEO3

llms.txt

llms.txt / LLM向けサイト案内ファイル

A proposed text file placed at the site root to help LLMs understand a site. Like robots.txt but for AI comprehension, it describes site purpose, key pages, and context in Markdown — currently an informal community standard.

SEO4

Local SEO

ローカルSEO / 地域SEO / Local Search Optimization

A branch of SEO focused on ranking for location-specific queries. Key tactics include optimizing Google Business Profile, targeting local keywords, maintaining consistent NAP data, and managing reviews.

SEO3

Query Fan-out

クエリファンアウト / クエリ分解

A query-processing technique used by Google AI Mode that expands a single user query into multiple parallel sub-queries, then synthesizes the results into a comprehensive answer.

SEO3

robots.txt

robots.txt / クローラー制御ファイル

A text file placed at the site root that specifies which URLs crawlers may or may not access, using User-agent and Disallow/Allow directives to control crawl scope.

SEO3

Scaled Content Abuse

大量コンテンツ生成スパム / Scaled Content Spam

A Google spam policy violation that covers generating large volumes of low-quality content using AI or automation primarily to game search rankings rather than help users.

SEO4

Schema.org

Schema.org / 構造化データボキャブラリー

A shared vocabulary for structured data, jointly maintained by Google, Microsoft, Yahoo, and Yandex. Implemented via JSON-LD or Microdata, it gives search engines a common language to understand page semantics.

SEO3

Search Console

Google Search Console / GSC / 旧Webmaster Tools

Google's free site management tool for monitoring search performance, index coverage, Core Web Vitals, and manual actions, as well as submitting sitemaps and requesting URL indexing.

SEO5

SEO (Search Engine Optimization)

Search Engine Optimization / 検索エンジン最適化

The practice of improving a site's visibility in search engine results through technical, content, and link-building optimizations — increasingly intertwined with LLMO in the AI search era.

SEO3

Sitemap

XML Sitemap / サイトマップ / sitemap.xml

An XML file that lists all URLs on a site to guide search engine crawlers. It can specify priority, change frequency, and last-modified date, accelerating indexing of new content.

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