An automation rule is a rule that automatically applies an action to a prospect based on whether they match set criteria. An automation rule consists of two parts: the criteria and the action. The criteria are the conditions that the prospect must meet to trigger the rule, such as having a certain score, grade, or field value. The action is the outcome that the rule will apply to the prospect, such as changing their field value, adding them to a list, or sending them an email. An automation rule can run once or multiple times per prospect, depending on the settings