adjective [usually ADJECTIVE noun] A test, system, or procedure that is rigorous is very thorough and strict.

Google Search is a fully-automated search engine that uses software known as web crawlers that explore the web regularly to find pages to add to our index.

The Google Search algorithm is a complex system Google uses to decide how pages will rank in the search results. The algorithm is believed to consider hundreds of factors. Content relevance, quality, and the user experience (UX) are among the most important ones (more on each of these below).

To give you the most useful information, Search algorithms look at many factors and signals, including the words of your query, relevance and usability of pages, expertise of sources, and your location and settings. The weight applied to each factor varies depending on the nature of your query.