IBM wants to put all it's IT department services, processing, application,s etc on the cloud. Platform-as-a-service would be the best approach for them.
What is a cloud service?
Cloud services are infrastructure, platforms, or software that are hosted by outside providers and made accessible to customers online.
Cloud services make it easier for user data to move from front-end clients (such as servers on users' ends, tablets, desktops, and laptops), across the internet to the providers' systems, and back again.
Cloud computing services include any platforms, technologies, infrastructure, or software that consumers can access online without downloading extra software.
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