Which three tags does Google Analytics require for accurate campaign tracking?

Google Analytics requires three specific tags for accurate campaign tracking: Medium, Source, and Campaign. These are essential for identifying where your traffic comes from (Source), how it arrived (Medium), and the specific marketing initiative it's associated with (Campaign). Without these three, Google Analytics cannot accurately categorize and report on your campaign performance. While Content and Term are also valuable for more granular tracking within a campaign (e.g., distinguishing different ad versions or keywords), they are not strictly required for the fundamental campaign tracking functionality.