Call-in Rate is the average number of inbound calls received per paid user of a product or service. It is used to monitor changes in call volumes, which can be an early warning sign of product or service issues, and even potential churn.

Campaign Clicks is a count of the total number of times users clicked on digital advertisements in a campaign. A campaign is a grouping of ads organized by business objective.

Campaign Cost per Goal Conversion is the amount of money spent on an ad campaign, also called Campaign Spend, that leads to a goal conversion. It is used to measure the costs involved in the success of an ad campaign which consists of several ads with a single business objective.

Campaign Engagement is the sum of total engagement that has taken place with an ad campaign. This performance metric usually measures a combination of clicks and other interactions such as comments, reactions, and shares.

Campaign Engagement Rate is the sum of total engagement with an ad campaign divided by the sum of total impressions the campaign has generated. It gives the percentage of ad impressions that have resulted in actual interactions with the ad campaign.

Campaign Impressions is a count of the total number of times digital advertisements within a campaign are shown. A campaign is a grouping of ads organized by business objective.

Campaign Reach is a count of the number of people who viewed your digital advertisements within a campaign at least once. A campaign is a grouping of ads organized by business objective.

Campaign Spend is the amount of money spent on advertisements within a campaign. A campaign is a grouping of ads organized by a common business objective; a digital marketing campaign achieves this objective via digital channels only.

Campaign Unique Clicks is a count of the number of people who clicked on your digital advertisements within a campaign at least once. A campaign is a grouping of ads organized by business objective.

Click To Open Rate (CTOR) is the percentage of unique clicks and unique opens for your email campaign. It is an effective measure of how compelling your content is relative to the quality of your target list. In other words, ensuring you have emailed the right audience and have presented them with a compelling call to action will increase your CTOR.

Click-Through Rate (CTR) is the percentage of clicks on your link that generate impressions. CTR is broadly applicable to links on web pages and in emails and advertisements. Used for email marketing or digital advertising, CTR is one of the most popular measures of campaign performance.

Contacts are individual people that the business has a relationship with, often associated with an account. In many Customer Relationship Management Systems (CRMs), such as HubSpot and Salesforce, Contacts are associated with qualified opportunities, existing customers, or past customers. Leads are usually not counted as Contacts.