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# SEO Meta Tags - canonical, robots

There are techniques used to prevent penalties from search engines due to duplicated content across multiple web pages, or to hide certain pages from search engines.

Let's explore the meta tags `canonical` and `robots` that are utilized in these situations.

<br />

## canonical Link

A `canonical` link informs search engines which page is the "official" version when there is duplicated content across multiple pages.

### Example:

```html title="Canonical link example"
<head>
  <link rel="canonical" href="https://example.com/original-article" />
</head>
```

This canonical tag informs search engines that the page "https://example.com/original-article" is the official version among the duplicates.

<br />

## robots Meta Tag

The `robots` meta tag directs search engines to either allow or disallow indexing of certain pages.

When you don't want to share specific documents or information with others, you can use the robots meta tag as follows.

Example:

```html title="Robots meta tag example"
<head>
  <meta name="robots" content="noindex, nofollow" />
</head>
```

The robots tag is a crucial meta tag that tells search engines not to crawl a specific page. This can prevent certain pages from appearing in search engine results.

### Which meta tag instructs search engines not to crawl a specific page?