Webmaster Tools is the generic name used for online services and tools provided by major search engines (such as Google Search Console or Yandex Webmaster Tools). These tools act as a central command center and communication bridge between the website owner and the algorithms of the respective search engine. Their main function is to provide diagnostics, performance data, and tools to manage the visibility of the site in organic results.
Conceptually, the Webmaster Tools is a critical tool for technical SEO and monitoring. It allows administrators to assess indexing status (which pages are indexed, which are excluded), receive error alerts (such as mobile usability issues or crawl errors), monitor search performance (impressions, clicks, keywords), and submit important files such as sitemap.xml.
This tool is the primary source of authoritative information about SEO. Its expert use eliminates the guesswork about how a search engine perceives a site and is absolutely essential for maintaining a healthy and technically optimized website.