UTM parameters work by appending specific tags to your URLs. When someone clicks a link in your email, the tags are sent back to your analytics platform (such as Google Analytics), which then records the data. The basic UTM parameters include: - utm_source: Identifies the source of the traffic (e.g., "newsletter"). - utm_medium: Identifies the medium (e.g., "email"). - utm_campaign: Identifies the specific campaign (e.g., "spring_sale"). - utm_term: Identifies paid search keywords (optional). - utm_content: Differentiates similar content or links within the same email (optional).