Set actions allow you to add context to the conversation in order to be able to reuse the information (context) later in the script.
The context variable that holds this information can be reused to guide the caller in the script, or to variabilize text, emails, SMS, API calls.
In order to delete a context key, you must use an Update action.
In order to quickly create a context key: type "boolean", value "true", you can use the "Update actions".