What is Search Engine Optimization (SEO)?
Search Engine Optimization (SEO) is the practice of optimizing a website’s structure, content, and authority signals to rank higher in organic (unpaid) search engine results — primarily Google, Bing, and increasingly LLM-based search (Perplexity, ChatGPT, Claude). Done well, SEO delivers compounding, cost-effective customer acquisition.
The three pillars of SEO
- Technical SEO: Crawlability, indexability, site speed, mobile responsiveness, structured data (Schema.org), canonical tags, sitemap, hreflang
- On-page SEO: Keyword research, title tags, meta descriptions, header hierarchy (H1/H2/H3), internal linking, content quality, image alt text
- Off-page SEO: Backlinks from authoritative sites, brand mentions, PR, partnerships, domain authority
Content strategy
Modern SEO is content-first. Pillar pages + topic clusters, long-form (1500-3000 word) cornerstone content, comparison/listicle/how-to formats, fresh + evergreen mix. E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) is Google’s stated quality framework — author bios, citations, and credentials matter.
Core Web Vitals (technical)
- LCP (Largest Contentful Paint): ≤ 2.5s — hero image / main content load speed
- INP (Interaction to Next Paint): ≤ 200ms — interactivity responsiveness
- CLS (Cumulative Layout Shift): ≤ 0.1 — visual stability
2025 shift: LLM Optimization (LLMO/GEO)
As AI search assistants (ChatGPT Search, Perplexity, Claude) become major referrers, optimizing for citation in AI answers matters. Tactics: clear FAQ schema, definitional content, llms.txt files, structured data, citing primary sources. LLMO is becoming a parallel discipline.
Practical implications for founders
For startups, SEO is a 12-24 month compound game — start early, expect no traffic for 6-9 months. Focus on: (1) one tight niche keyword cluster; (2) shipped technical foundation (Schema, page speed); (3) consistent publishing cadence (1-2 quality posts/week). Avoid: black-hat link buying, keyword stuffing, AI-generated thin content. See our Insights for current SEO + LLMO best practices.