IaaS-Infrastructure as a Service only offers clients access to networks, servers, and storage.
Software as a Service, or SaaS, is the name for this. You would just log in to the system and start using software that is available on demand. The operating system doesn't need to be configured. The application need not be written by you. Furthermore, neither the program nor the data require maintenance.
Apply the patches first to the systems in a testing environment, then to the systems in a staging environment, and lastly to the systems in production.
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