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What Is SEO?

최종 업데이트:

Definition

SEO is the practice of optimizing content so it ranks prominently in search engines.

Summary

SEO (Search Engine Optimization) is the work of optimizing technical setup, content, and links so pages appear in top results on search engines such as Google and Bing. Even in the AEO and GEO era, SEO remains the foundation layer, and AI answer engines still use SEO signals such as domain authority and backlinks as trust indicators.

The Three Pillars of SEO

SEO is broadly divided into three areas.

1. Technical SEO

This is the foundational work that helps search engine crawlers discover and index a site correctly. It includes page load speed, mobile optimization, Core Web Vitals, robots.txt, sitemaps, HTTPS, and more. When technical SEO breaks down, even excellent content may never appear in search results.

2. On-Page SEO

This is the work of optimizing individual pages so search engines judge them highly relevant to specific queries. It includes title tags, meta descriptions, H1–H6 structure, keyword placement, internal links, and structured data (JSON-LD). High-quality content that meets E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) standards is central.

3. Off-Page SEO

This is represented mainly by backlinks from other sites and brand mentions. The more trustworthy external sites link to your site, the higher your domain authority becomes, and the more positively it affects search rankings.

Why SEO Still Matters

Some argue that SEO is dying as AI search rises, but the reality is different.

According to BrightEdge's 2025 data, most content cited in Google AI Overviews is already within the top 100 results for that query. AI answer engines still prioritize trustworthy sources, and that trust remains strongly tied to traditional SEO indicators such as domain authority, backlinks, and content quality.

Semrush's 2026 data also shows that organic search remains a major web traffic channel. Gartner's prediction that "search engine traffic will drop 25% by 2026" reflects coexistence with AI search, not the disappearance of SEO itself.

SEO is the foundation layer for AEO and GEO. It is difficult to succeed with AEO and GEO alone without SEO, and strong SEO naturally improves AEO and GEO outcomes as well.

SEO in Regional Search Markets

Search behavior varies by market. In many regions, Google dominates, while local platforms such as Naver in Korea or Baidu in China play a major role alongside global engines. Because ranking algorithms differ, strategy should match the platform.

Google SEO: Follows global standards. E-E-A-T, Core Web Vitals, backlinks, and structured data are core factors.

Regional search platforms: Local platforms often prioritize content within their own ecosystems. Vertical services, local business listings, and platform-specific trust signals can matter as much as traditional web SEO.

Core SEO Metrics

MetricDescription
Organic trafficVisitors arriving through search results without paid ads
Keyword rankingsPosition on the search results page for target keywords
Domain authority (DA/DR)Trust score based on the site's overall backlink profile
Click-through rate (CTR)Ratio of clicks to search result impressions
Core Web VitalsGoogle page experience metrics made up of LCP, INP, and CLS

Frequently Asked Questions

Q. How are SEO, AEO, and GEO different?
A. SEO optimizes rankings in traditional search engines, AEO optimizes citations in AI answer engines, and GEO is a broader concept that includes getting content reflected in generative AI training data. They are layers, not replacements. See SEO vs AEO vs GEO for a detailed comparison.

Q. How long does SEO take to work?
A. New content typically needs 3–6 months to reach stable rankings. Lower domain authority usually means a longer timeline. Technical SEO improvements such as speed fixes and index error corrections can show results within weeks.

Q. Is SEO still necessary in the AI era?
A. Yes. AI answer engines still use domain authority and backlinks when selecting trustworthy sources. Without an SEO foundation, AEO and GEO optimization is limited. SEO is closer to an entry requirement for the AI search era.

Q. Can small sites compete with SEO?
A. Yes. Large sites do not cover every keyword. By building deep content on specific niche topics, you can rank highly in that area regardless of domain size. Niche AEO and GEO opportunities also exist in languages and markets with lower competition than English.

Sources

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