Google is not considered a default medium in Google Analytics.
According to Google Analytics Help articles, Google is considered a source. Source means the origin of traffic, for example, a search engine or a domain. On the other hand, a medium stands for the general category of the source, for example, organic search (unpaid search) or web referral (referral).
Overall, Google Analytics has only three default mediums: organic, referral, and none.
- The organic default medium describes traffic coming to a website from organic or unpaid searches.
- The referral default medium represents any traffic coming to a website from another web resource, not a search engine. In the reports, such traffic is marked as “referral.”
- The default medium is used for users who visit a website after directly typing its URL in a browser or clicking a bookmark. The reports show such users with a “direct” source and “none” medium.
What is not considered a default “medium” in Google Analytics? https://support.google.com/analytics/answer/6099206