When I need to use canonical tag?

[virginoilseom]

When I need to use canonical tag?

[jackar56]

you should use the canonical tag every page for search engine

[alwaysprompt]

The canonical tag is used to mention duplicate content on our website. You can do it by specifying the “canonical URL” and enter “preferred” version of a web page. If you have duplicate content on your website then using canonical tag will help in SEO of your website.

[sulbha]

A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical" or "preferred" version of a web page as part of search engine optimization.
When to use Canonical:

-> When 301s can’t be implemented, or take too much time.
-> Duplicate content but you want to keep both pages live.
-> Dynamic pages with multiple URLs of a single page (from sorting features, tracking options, etc.).
-> Site-wide considerations like (domain/page/index.html vs. domain/page/ for the same page) can be easier with canonicals.
-> Cross-domain considerations where both sites are similar, but need to remain live.

[RH-Calvin]

A canonical tag is a way of telling search engines that a specific URL represents the master copy of a page. Using the canonical tag prevents problems caused by identical or "duplicate" content appearing on multiple URLs. Practically speaking, the canonical tag tells search engines which version of a URL you want to appear in search results.

[damponting44]

The canonical tag is utilized to specify copy content on our site. You can do it by determining the "authoritative URL" and enter "favored" rendition of a site page. On the off chance that you have copy content on your site at that point utilizing standard tag will help in SEO of your site.

[Nas]

Canonical tags are used to tell spiders/crawlers which webpage must be returned from particular set of URLs. They should be used for avoiding 404 errors.