Lets see what is IaaS, Paas and Saas. But before that lets understand what is On- Premises.
On- Premises solutions:
All physical hardware is purchased and maintained by you like physical server, network cables, power supply everything. You are responsible for installing of operating services and maintain them as well.
Advantage: You have full control over the system.
Disadvantage: You need to focus on these things too instead on focusing on the business.
Infrastructure As a service (IaaS):
With IaaS, we are responsible for operating system but hardware is taken care by Azure. Azure will be responsible for network cables, power supplies, backups, security, fiber network and others.
Advantage: You can focus on business without worrying about any hardware.
Disadvantage: You don’t have complete control over the hardware.
Platform as a service (PaaS):
With PaaS, Azure is responsible for hardware and operating systems. Azure is responsible for installing the operating system, security patches, hardware and others. We just need to worry about the Apps. Whenever you want you can update or downgrade according to your needs
Advantage: You can completely focus on business without worrying about any hardware or software.
Disadvantage: You don’t have complete control over the hardware and software
Software as a Service(SaaS):
With SaaS, you don’t need to worry about anything. No hardware, operating system or applications. You can directly use the applications on usage basis. Few basic examples are email service, office365 etc.
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