Additional information can be found directly on the Google website:

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Duplicate content can confuse search engine algorithms by making the same data available under multiple URLs. This can lead to inefficient use of crawl resources, as well as dispersion of SEO value (e.g. backlinks) across many similar pages. By using a canonical link, site owners can clearly indicate to Google which version of the URL is the “main” one. As a result, all SEO value is concentrated in one, selected version of the page, contributing to better positioning.

Canonical linking also has other benefits, such as protecting personal data. Given loan phone number data that different forms on a page can lead to different URLs that ultimately present the same content, using the canonical tag can ensure that users and search engines focus on a single, canonical version of the page, around a single URL, which can help maintain user privacy by avoiding the spread of personal data across multiple versions of the page. It works in a similar way to "I consent to the processing of personal data."

Defining a canonical link as an HTML code element
Canonical URL , provides a number of benefits for optimizing a page for SEO. This specific element of HTML code, also known as a canonical tag or canonical url. Using a canonical URL allows Google and other search engines to understand which version of the page to treat as the main, canonical one. In other words, it helps identify the preferred.