Search engine

A search engine is a software system designed to find information on the World Wide Web. It works by systematically crawling web pages, indexing their content and then providing the user with the most relevant results based on the keyword or question entered. The results are usually shown in a list known as the SERP (search engine results page).

A search engine is not merely a “box” you type text into. It is a complex mechanism working in three basic phases:

Crawling: automated robots (spiders or bots) continually discover new and updated pages by following links.
Indexing: the pages found are analysed and stored in an enormous database (the index).
Ranking: algorithms order the indexed pages by relevance and quality so that the user gets the best answer.

The dominant global search engine is Google, but alternatives matter too: Bing (Microsoft), DuckDuckGo (privacy-focused) and the local Czech Seznam.

Practical example

Imagine someone whose pipe bursts in the night. They type into a search engine: “emergency plumber Bratislava”. In a fraction of a second the search engine sifts billions of pages and places at the top of the SERP the plumbers who are nearest, have good reviews and have their local SEO set up properly. The plumber in first position wins the job. This process of turning a search into a buying decision is the foundation of modern digital business.