How a Website Instructs Crawling?

A robots.txt file is like a guide for search engines. Think of it as a polite way to tell search engine robots which parts of your blog they can or can't look at. It's a simple text file placed in your blog's root directory. For instance, if you want to keep certain pages private or avoid having them indexed, you’d specify that in this file. 

Here's a quick example: If you don't want search engines to crawl your admin area, your robots.txt might include:

```

User-agent: *

Disallow: /admin/

```

This tells all search engines to stay away from the /admin/ directory. On the flip side, if you want everything to be indexed, you can leave the file empty. 

In short, it's a tool for managing your blog’s visibility and making sure search engines focus on the content you want them to.