UTM basics
What UTM parameters tell you
UTM parameters are short labels added to a link so analytics platforms can identify the campaign that brought a visitor to a page. Source identifies where the click came from, medium describes the channel, and campaign names the promotion.
Use term for a paid-search keyword and content to compare variants such as a header button and a footer link.
Worked example
Keep campaign naming consistent
For a summer email promotion, a link might use utm_source=newsletter, utm_medium=email, and utm_campaign=summer-sale. Consistent lowercase names and hyphens make reports easier to group and compare.
UTM parameters are visible in the URL. They should describe marketing activity, never include private information, email addresses, or customer identifiers.