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“Optimization & Promotion” Some Explanations Regarding the Canonical Tag
If a website has many pages with different URLs but identical content, this is not favorable from the perspective of website SEO. Different URLs accessing the same content may lead to misjudgment by search engines. The appearance of the **canonical tag** can help alleviate this problem as much as possible.
What is the canonical tag? It is a tag explicitly supported by Baidu, designed to send a message to search engines: crawl and prioritize the key content that the webmaster intends to display.
This tag partially overlaps with the 301 permanent redirect in function, but there are also differences, as follows:
If you want multiple URLs to access highly similar or identical content, the canonical tag is suitable. If you want only one specific URL to access the target content, using a 301 permanent redirect is more appropriate.
Detailed explanation:
Both pages can access content about “Several Technical Issues Unfavorable to Website SEO”, yet their URL structures are different. Search engines cannot determine which URL represents the more important content. Without proper configuration by SEO personnel, search engines will index large amounts of duplicate content on the target site. Over time or at scale, this may result in penalties such as website downgrading. How to solve this? The canonical tag comes into play.
The solution is to add a piece of code in the <head> section of the content page:
The purpose of this tag is to inform search engines to index the URL specified by the canonical tag, while treating other similar, analogous, or even identical content URLs as duplicate pages. These duplicate URLs will not participate in the allocation of page authority.
Note: In addition to Baidu, other mainstream search engines such as Google also support the use of this tag.
