definition

Search Engine Optimization (SEO) is the practice of improving a website’s visibility in search engine results pages (SERPs) to attract more organic (non-paid) traffic.

SEO involves optimizing content, website structure, and technical performance so that search engines like Google or Bing can better understand, rank, and deliver a site to users searching for relevant information.

SEO took a major leap forward in 1998 with the launch of Google, whose founders introduced PageRank, an algorithm that evaluated websites based on the quality and number of inbound links.

This made link-building a dominant SEO tactic in the early 2000s, as businesses raced to acquire backlinks to climb Google’s rankings. During this period, practices like directory submissions, link exchanges, and even link farms became widespread. Some legitimate, some manipulative.

While Google’s algorithms have grown far more sophisticated since then, the influence of PageRank cemented SEO as a critical part of online business strategy.

Modern SEO typically includes on-page optimization (using relevant keywords, titles, and internal links), off-page strategies (earning backlinks from other reputable websites), and technical improvements (such as mobile responsiveness and fast loading speeds).

A simple example is a startup that writes an educational blog post about “remote team productivity tools.” By optimizing the article with relevant keywords, clear formatting, and links to related content, the company increases its chances of ranking higher in search results, attracting potential customers who are seeking solutions or answers.

Even today, with generative AI search, SEO remains one of the most cost-effective channels for growth.

Unlike paid advertising, which stops driving traffic once the budget runs out, well-executed SEO efforts can generate consistent visibility and customer acquisition over the long term.