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Cloud Computing Basics

1. Differences between IaaS, PaaS, and SaaS​

  • IaaS (Infrastructure as a Service):
    Provides fundamental IT resources such as virtual machines, networks, and storage. Users manage the OS and applications on top of the provided infrastructure.

  • PaaS (Platform as a Service):
    Offers an environment for application development including OS, middleware, and runtime. Developers can focus on building applications without managing the underlying infrastructure.

  • SaaS (Software as a Service):
    Delivers complete applications over the internet to end users. All infrastructure and application maintenance is handled by the service provider.

2. Key Features of Cloud (On-demand, Scalability, Flexibility)​

  • On-demand Access:
    Resources can be provisioned and used instantly, based on business needs, without prior commitments.

  • Scalability:
    Systems can scale up or down easily depending on the workload or user demand.

  • Flexibility (Elasticity):
    Cloud environments can automatically handle traffic spikes and fluctuations without manual intervention.

3. Public, Private, and Hybrid Cloud Models​

  • Public Cloud:
    Cloud services offered over the internet and shared among multiple organizations. Typically provided by third-party vendors such as AWS, Azure, or Google Cloud.

  • Private Cloud:
    A cloud environment dedicated to a single organization, providing greater control and security. Often used by enterprises with strict compliance needs.

  • Hybrid Cloud:
    Combines public and private cloud environments, allowing organizations to leverage the benefits of both models—such as scalability from public cloud and control from private cloud.