We're rolling out an improvement to Shopify Markets which allows your store to have multiple domain configurations that target different language experiences on the primary market.
For example, in Canada there are two official languages - English and French. If Canada is your primary market, you may want to target English speakers on shop.ca and French speakers on fr.shop.ca. Previously, only subfolders could be used to target multiple language experiences within the primary market. This can now be done with subfolders, domains, or subdomains.
Read more about setting up different domains or URLs in the Shopify Help Center.