# What is SEO? — SEO for Developers

Source: https://www.geekswithgeeks.com/en/seo-developers/seo-intro

> The fundamentals of search engine optimization and why developers need to understand it.

## Why SEO matters

**SEO** is the practice of improving your website's visibility in search results. When a user searches "best pizza near me" or "how to learn JavaScript," SEO determines whether your site appears at the top or on page 10. Good SEO means free, organic traffic; bad SEO means users never find you.

## Three pillars of SEO

**Technical SEO** ensures search engines can crawl and index your site. **On-Page SEO** optimizes content, titles, and structure. **Off-Page SEO** builds authority through backlinks and social signals. Developers own technical SEO; it's built into the code and architecture.

## Organic vs paid search

**Organic traffic** comes from unpaid search results; **paid traffic** comes from ads (Google Ads, Bing). Organic traffic is slower to build but costs nothing per click and lasts. Paid traffic is immediate but stops the moment you stop paying.

**Quiz:** Which SEO pillar do developers primarily control?

- [x] Technical SEO — site speed, crawlability, structured data
- [ ] Off-Page SEO — backlinks and social signals
- [ ] Content writing and keyword research

*Answer:* Technical SEO — site speed, crawlability, structured data. Developers build the technical foundation; content and marketing teams handle on-page and off-page optimization.