You can add notes and labels when you create or edit any Dynamic Yield experience. Both notes and labels have no effect on the experience at all, but can be used as tools to manage and filter experiences in Experience OS.
Labels are reusable strings that can be used to associate experiences with each other. For example, you might add a label for each seasonal campaign, or one to indicate which office is responsible for an experience. You can add multiple labels for each experience.
In the campaign list page, you can search and filter based on labels to quickly find campaigns.
Notes are internal strings (up to 150 characters) you can add to your experiences. They are often used to save internal descriptions of your experiences. They can be very useful for describing the purpose of an A/B test, the goals or aims of an experience, or any other internal note you might need to help you work with the experience.