术语表

301 Redirect

301 Permanent Redirect

An HTTP status code permanently redirecting one URL to another, transferring most link equity to the new URL.

Alt Text

Image Alternative Text

A text description of an image for accessibility and SEO, displayed when the image cannot be loaded.

Anchor Text

Link Anchor Text

The visible clickable text of a hyperlink, providing context to search engines about the linked page's topic.

Canonical URL

Canonical URL Tag

An HTML element specifying the preferred version of a page when duplicate or similar content exists at multiple URLs.

Core Update

Google Core Algorithm Update

A broad change to Google's ranking algorithm affecting search results globally, often shifting traffic significantly.

Crawl Budget

Search Engine Crawl Budget

The number of pages a search engine will crawl on a site within a given time period.

Duplicate Content

Duplicate Content Issue

Substantially identical content appearing at multiple URLs, which can dilute search rankings and cause indexing confusion.

Edge SEO

Implementing SEO changes at the CDN or edge layer (e.g. Cloudflare Workers) without modifying the origin server.

E-E-A-T

Experience, Expertise, Authoritativeness, Trustworthiness

Google's quality rater guidelines criteria for evaluating content quality, especially important for YMYL topics.

Entity SEO

Entity-Based SEO

An optimization strategy focused on establishing entities and their relationships in Google's Knowledge Graph.

INP

Interaction to Next Paint

A Core Web Vital measuring the latency of user interactions (clicks, taps) until the next visual update (target: under 200ms).

Knowledge Graph

Google Knowledge Graph

Google's knowledge base that connects entities and facts to enhance search results with panels, carousels, and direct answers.

SERP

Search Engine Results Page

The page displayed by a search engine in response to a query, containing organic results, ads, and featured snippets.

Hreflang

Hreflang Attribute

An HTML attribute telling search engines which language and region a page targets, preventing duplicate content across locales.

Schema Markup

Schema.org Structured Data

A vocabulary of tags added to HTML to help search engines understand page content and display rich results.

JSON-LD

JSON for Linking Data

A format for embedding structured data in web pages using JSON within a script tag, preferred by Google.

Rich Snippet

Rich Search Result Snippet

Enhanced search results displaying additional information (ratings, prices, FAQs) extracted from structured data.

Robots.txt

Robots Exclusion Protocol

A text file at the site root instructing search engine crawlers which pages or directories to avoid.

Sitemap XML

XML Sitemap

An XML file listing all important URLs on a site, helping search engines discover and index content efficiently.

Meta Description

Meta Description Tag

An HTML meta tag providing a brief summary of a page's content, often displayed in search engine results.

Title Tag

HTML Title Tag

The HTML element defining the title of a web page, displayed in browser tabs and search engine results.

Backlink

Inbound Backlink

A hyperlink from one website to another, used by search engines as a signal of content authority and trust.

Internal Linking

Internal Link Structure

Hyperlinks connecting pages within the same website, distributing link equity and helping crawlers discover content.

Core Web Vitals

Google's set of user experience metrics: LCP (loading), INP (interactivity), and CLS (visual stability).

LCP

Largest Contentful Paint

A Core Web Vital measuring the time until the largest visible content element is fully rendered (target: under 2.5s).

CLS

Cumulative Layout Shift

A Core Web Vital measuring unexpected layout movement during page load (target: under 0.1).

IndexNow

IndexNow Protocol

A protocol allowing websites to instantly notify search engines about content changes for faster indexing.

Noindex

Robots Noindex Directive

A meta tag or HTTP header instructing search engines not to include a page in their search index.

Keyword Density

The percentage of times a keyword appears in text relative to the total word count, used to avoid keyword stuffing.

Open Graph

Open Graph Protocol

A set of meta tags controlling how pages appear when shared on social media (title, description, image).

Breadcrumb

Breadcrumb Navigation

A hierarchical navigation trail showing the user's location within a site, enhancing UX and enabling rich results.

YMYL

Your Money or Your Life

Google's classification for pages that could impact a user's health, finances, or safety, held to the highest quality standards.

Helpful Content

Helpful Content System

A Google ranking system rewarding people-first content and demoting content written primarily for search engines.

Topical Authority

A site's perceived expertise on a subject, built by creating comprehensive, interlinked content covering all aspects of a topic.

Knowledge Panel

Google Knowledge Panel

An information box appearing in Google search results, displaying key facts about a recognized entity.

Featured Snippet

Google Featured Snippet

A highlighted excerpt from a web page displayed at the top of Google search results, answering the query directly.

People Also Ask

People Also Ask (PAA)

An expandable section in Google results showing related questions, each linking to a featured snippet from a different page.

Local Pack

Google Local Pack

A SERP feature showing three local business results with a map, triggered by location-based search queries.

Rendering Budget

Search Engine Rendering Budget

The computational resources a search engine allocates to render JavaScript-dependent pages for indexing.

Log File Analysis

SEO Log File Analysis

Examining server access logs to understand how search engine crawlers interact with a site's pages.

Page Experience

Google Page Experience Signal

A ranking signal combining Core Web Vitals, mobile-friendliness, HTTPS, and no intrusive interstitials.

TTFB

Time to First Byte

The time between a browser's HTTP request and receiving the first byte of the response, measuring server responsiveness.

Domain Authority

Domain Authority Score

A search engine ranking score predicting how likely a website is to rank in search results, based on backlink profile and domain age.

Long-Tail Keyword

A specific, multi-word search query with lower volume but higher conversion intent, such as 'convert PNG to PDF online free'.

Nofollow

Nofollow Link Attribute

An HTML attribute (rel='nofollow') that tells search engines not to pass ranking credit through a hyperlink.

Pagination SEO

SEO Pagination Best Practices

Techniques for helping search engines crawl paginated content, including rel=next/prev, load-more patterns, and view-all pages.

Search Intent

User Search Intent

The underlying goal behind a search query — informational, navigational, transactional, or commercial — guiding content strategy.

Passage Ranking

Google Passage Ranking

A Google feature that indexes and ranks individual passages within a page, allowing specific sections to appear in search results.