Campaign tracking is the practice of measuring the performance of individual marketing campaigns — such as a specific email send, social promotion, or paid ad set — typically by tagging links with identifying parameters like UTM tags so resulting traffic and conversions can be attributed back to that exact campaign.
Without campaign tracking, all traffic from a channel like social gets lumped together regardless of which specific post drove it; with it, a team can compare an April product-launch campaign against a May seasonal-sale campaign on the same channel, side by side. Consistent, disciplined tagging is the system's weak point in practice — a single mistyped or missing parameter on one link can silently drop that traffic into a generic bucket, undercounting a campaign's true performance.
A marketing team running both a holiday promotion and a general brand-awareness campaign on the same social platform can use distinct utm_campaign values on each set of links to see, separately, how many conversions each specific campaign generated rather than one blended social-traffic number.
UTM parameters appended to campaign URLs are the most widely used method, since most analytics platforms automatically parse and report on them, though some ad platforms also offer their own built-in campaign tracking that syncs with their reporting.
The resulting traffic typically falls back to whatever the analytics tool infers from the referrer alone, usually landing in a generic channel bucket rather than being attributed to the specific campaign, undercounting that campaign's measured performance.
No — it applies to any trackable initiative with its own links, including email newsletters, organic social posts, affiliate partnerships, and even QR codes on physical materials, as long as the links are tagged consistently.