Robots.txt is a file used to give instructions to web robots (typically search engine crawlers) about a website. It plays an important role in technical SEO.
The robots.txt file, which is placed in the root directory of a website, tells search engine crawlers which pages or directories they can or cannot request from your site.
Some key use cases of robots.txt include:
- Preventing crawling of specific pages/directories
You can disallow crawling of pages with sensitive data, login areas, admin sections etc by adding them in the robots.txt as disallowed. - Making your public pages crawlable
Conversely, you can explicitly allow crawling of the pages/sections you want indexed by search engines. - Increasing crawl efficiency
You can point crawlers to the most important sections of a large site, improving crawl prioritization and efficiency. - Specifying crawl rate
You can use the robots.txt to control the crawl rate to avoid overloading your server.
While robots.txt is not a mechanism to guarantee pages won’t be indexed, reputable search engines follow the directives as part of good practice.
From an SEO perspective, proper use of robots.txt helps search engines crawl and index your desired pages effectively. Disallowing crawling of sensitive areas also improves security. Overall, it optimizes how search engine bots interact with and crawl your website.
However, it’s just one part of a technical SEO strategy. Aspects like site architecture, internal linking, canonicalization also play a crucial role in helping search engines access, crawl and index a website optimally.