The robots.txt file is a simple text file used by webmasters to communicate with web robots (often called spiders) and other web crawlers. The file specifies which parts of a website should not be crawled or indexed by these automated agents.
The format of the robots.txt file is very simple and consists of a series of User-agent lines followed by Disallow lines. For example:
javascript
User-agent: *
Disallow: /secret/
This example tells all web robots that they should not crawl any pages in the /secret/ directory.
It's important to note that while most web robots honor the instructions in robots.txt, some may not. Additionally, malicious robots may ignore these instructions and crawl a site anyway. So, the robots.txt file should not be relied upon as a complete means of protecting sensitive information on a website.