What's the difference between API Cloud, API Gateway & API Portal ?


I’ve been reading the doco for API Cloud, API Gateway & API Portal and am confused about the difference between the three of them. Can anyone enlighten me ??


API Gateway:
webMethods API Gateway helps you to securely expose your
APIs to third-party developers, partners and other consumers. With
webMethods API Gateway you can easily create APIs, define
Service Level Agreement (SLA) policies, and seamlessly publish
your APIs to webMethods API Portal.

API Portal:
API Portal helps the developer community to find, read about, discuss and
test your APIs. API-Portal
provides a consumer-centric UI for the discovery of APIs. The
portal exposes API documentation to third-party developers,
manages the developer on-boarding process, and allows these
developers to use the exposed APIs for creative new uses.

API Cloud is a SaaS offering from SoftwareAG which includes both API Gateway/API Portal.

Thanks for that Arul.