Canonical tag
The canonical tag tells Google which URL is the main version of a page when the same content is available at several addresses.
Canonical tag – explained simply
Typical cases: filters and sorting in online shops, tracking parameters, or the same page with and without “www”. Without a canonical, Google has to decide itself – not always correctly.
Every page should point to itself or to its main version.
Practical tip for Swiss SMEs
In online shops, check that filter pages like “?colour=red” have a canonical pointing to the category page.
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