You can use Applications, for example, to group your campaigns by country, time zone, currency, or even by the teams managing your campaigns. You cannot share customer activity or campaigns across different Applications.
You can create Applications in one of the following environments:
They help you differentiate between testing and production Applications. For example, you can connect a sandbox Application to a mock environment on your end and use it to test rules for your campaigns. Then, you can copy those campaigns into a live Application connected to your actual website or app.
Customer profiles created in a given environment can only be accessed by Applications from the same environment. For example, customer profiles created in a sandbox environment cannot be accessed from a live Application.
A key difference between sandbox and live Applications happens in the Integration API.
By default, sandbox Applications provide you with more detailed information about why a rule
failed. Use this to test your campaigns faster. For more information, see the
Update customer profile and
Update customer session endpoint's