Companies have struggled over the years about whether to create one website for their entire business, or separate ones for different pieces. In most cases, Google stays stick to one.
You can read more at this article on Search Engine Roundtable.
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There are some reasons why a company may want to split their existing website into two separate sites, but in most cases they’re better off sticking with a single site.
A user recently asked Google: “Consider website A wants to sell its products using a white-label version of itself on Website B, Do you think it has any effect in terms of link juice on website A and B? Thanks“
Google’s John Mueller answered with: “If you make 2 websites out of one, you’re not going to be twice as visible in search.“
I see this most often with companies that will move their blog to another site (like ourcompanyblog.com). While this is sometimes a technical necessity (main site can’t support a blog, so they install WordPress as a separate site), but often it’s so they can try to get backlinks from the blog over to the main site.
A link is a link, whether it’s coming from another site or from an internal page on your own site. By splitting the blog onto a separate URL is simply splitting the visibility and equity of the main site.
As I said at the top of show, you might have good reasons for splitting the site, but I would advise you to consider it very carefully before you make that change.