What Is an If/Then/Otherwise Personalization?
An If/Then/Otherwise Personalization allows you to set up a specific personalization that will be triggered if one or more conditions are met. It lets you write different things to different contacts. It is often used for greetings or for writing one campaign in multiple languages. To choose the conditions, set the attributes, specify the matching criteria and formulate the personalization. (You can also include additional placeholders here, e.g., names and other Simple Personalizations.
Note that you can enter a default value in the Otherwise field at the bottom. This will be used if the contact doesn't meet any of the conditions you have set.