Channel Grouping
A set of rules that buckets traffic sources into readable categories like Organic Search, Paid Search, Email, and Referral. GA4 ships default channel groupings and lets you build custom ones, so reports summarize where visitors come from without listing every raw source and medium.
Why It Matters
Channel grouping turns messy source and medium data into a clear picture of which marketing efforts drive traffic and conversions. It is the foundation for budget decisions, letting you compare channel performance at a glance.
Common Mistake
Leaving campaigns untagged so paid or email traffic falls into the wrong bucket, usually inflating Direct or Referral. Consistent UTM tagging is what keeps channel grouping accurate.