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• APICloudPublisher: a publisher manages a set of APIs across the enterprise or business unit and controls the API lifecycle , subscriptions, and monetization aspectssubscription aspects. The publisher is also interested in usage patterns for APIs and has access to all API statistics.
• APICloudSubscriber: a subscriber uses the API store to discover APIs, read the documentation, and forums, rate/comment on the APIs, subscribes to APIs, obtain access tokens, and invoke the APIs.

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• To protect your APIs from common types of security attacks such as denial of service (DoS).
• To regulate traffic according to infrastructure availability.
• To make an API, application or a resource available to a consumer at different levels of service, usually for monetization purposes.

See Working with Throttling in the WSO2 API Manager documentation for detailed information about throttling, throttling limits, policies etc. 

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