Google Manufacturer Center helps you provide Google with the most up-to-date and authoritative product info, making it available to potential customers. This way, you’ll be able to drive sales and expand your brand’s reach whenever shoppers are searching and buying.
A canonical tag (aka “rel canonical”) 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.
Google Merchant Center helps you get your shop and product info into Google and make it available to shoppers across Google. That means that everything about your shops and products is available to customers when they search on a Google property.