Canonical Tag
The canonical tag (rel='canonical') is an HTML element used in web development to specify the preferred version of a webpage when multiple URLs have identical or very similar content. It helps search engines understand which URL to index and rank, preventing duplicate content issues that can harm SEO. This tag is placed in the <head> section of a webpage and points to the canonical URL.
Developers should use canonical tags when managing websites with duplicate content, such as e-commerce sites with product pages accessible via multiple URLs (e.g., with different sorting parameters), or when content is syndicated across domains. It is essential for SEO optimization to avoid penalties from search engines and ensure that link equity is consolidated to the preferred page, improving search rankings and user experience.