There are several metrics that digital marketers use to measure the success of a digital marketing campaign. Here are some of the most common metrics:

1. Conversion Rate: This is the percentage of website visitors who take a desired action, such as making a purchase or filling out a form.
2. Click-Through Rate (CTR): This is the percentage of users who click on a link or call-to-action (CTA) within an email, ad, or webpage.
3. Cost-per-Click (CPC): This is the amount of money you pay for each click on your ad.
4. Return on Investment (ROI): This measures the amount of revenue generated compared to the amount spent on the campaign.
5. Engagement Rate: This measures the level of interaction users have with your content on social media.
6. Bounce Rate: This is the percentage of website visitors who leave the site after viewing only one page.
7. Impressions: This is the number of times your ad or content is displayed to users.
8. Average Session Duration: This measures the amount of time users spend on your website.

By monitoring these metrics, digital marketers can gain insights into the effectiveness of their campaigns and make data-driven decisions to optimize and improve their digital marketing strategies.