A marketing campaign is a promotion of a product or service through different types of media. Campaigns allow you to aggregate several referrers and analyze their impact on results.
Examples of the marketing campaigns:
An important part of a marketing campaign is URL tagging, which allows companies to identify traffic from a particular campaign in web analytics software.
Conversion are also associated with campaigns, enabling you to accurately measure Return On Investment (ROI).
Read more about marketing campaigns and their optimization on the Piwik PRO blog:
A complete guide to campaign tracking in your web analytics platform