In analytics, source/medium refers to the origin (source) and category (medium) of traffic to a website. It provides information about where users come from and the channels through which they access a website.
Source indicates the specific platform or website that referred the user, while Medium categorizes the general type of traffic, such as organic search, direct, or referral.
Analyzing source/medium data might reveal that a significant portion of website traffic comes from the source "google" with the medium "organic."