Canonical URL

TL;DR: A Canonical URL is the preferred version of a webpage URL, used to specify the authoritative source when duplicate or similar content exists. It helps search engines understand which version of a page to index and display in search results, consolidating ranking signals for better SEO.
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When URLs of two or more pages are similar, search engines get confused about which one should be displayed for a particular keyword. This may result in duplicate content issues and affect the website’s SEO. Canonical URLs save websites from this problem by telling the search engines which page to index. 

Updated February 17, 2024
Axel Grubba is the founder of Findstack, a B2B software comparison platform, with his background spanning management consulting and venture capital where he invested in software. Recently, Axel has developed a passion for coding and enjoys traveling when he is not building and improving Findstack.