Definition
SEO, or search engine optimization, encompasses all practices and strategies for optimizing a website to appear in the top positions of unpaid search results. It rests on three fundamental pillars: technical (performance, crawlability, indexation), content (relevance, quality, keywords), and popularity (backlinks, domain authority). Unlike SEA (paid search advertising), SEO aims for lasting, organic results. An effective SEO strategy requires continuous optimization and adaptation to search engine algorithm changes.
Key Points
- SEO rests on three pillars: technical, content, and popularity (link building)
- SEO results are lasting but require continuous investment
- Google represents over 90% of searches in most markets
Practical Examples
On-page optimization
An e-commerce site restructures its product pages with optimized title tags, unique descriptions, and coherent internal linking, increasing organic traffic by 40% in 6 months.
Link building strategy
An agency implements a quality backlink acquisition campaign via guest posts and partnerships, moving from page 3 to page 1 on strategic keywords.
Frequently Asked Questions
SEO aims for free traffic through organic results, while SEA (Search Engine Advertising) involves buying paid ad space. SEO offers lasting but slower results, whereas SEA produces immediate results but stops when the budget runs out.
First results typically appear between 3 and 6 months. This depends on keyword competition, initial site authority, and effort intensity. A new site takes longer than an established one.
Go Further with LemmiLink
Discover how LemmiLink can help you put these SEO concepts into practice.
Last updated: 2026-02-07