def public_cloud():
    """
    Returns a detailed summary of all important Public Cloud points
    including advantages and disadvantages.
    """

    summary = """
Public Cloud — Key Points

1. Definition:
   A public cloud is a cloud deployment model owned and operated by an external
   cloud provider. Computing resources such as virtual machines, storage, and software
   services are delivered over the public internet to multiple users on a pay-per-use basis.

2. Ownership:
   The entire infrastructure is owned, managed, and maintained by the cloud provider.
   Organizations simply rent the required resources.

3. Characteristics:
   - Highly scalable and flexible.
   - No geographical limitations for access.
   - Very cost-effective, especially for small and mid-sized businesses.
   - Minimal management burden since the provider handles infrastructure.
   - Suitable for generic, non-sensitive workloads.

4. Purpose:
   Used when organizations want to lower operational costs, avoid hardware
   maintenance, and scale resources easily on demand.

5. Security:
   Security is lower compared to private cloud for sensitive workloads because
   resources are shared among multiple tenants.

6. Typical use cases:
   - Website hosting.
   - Application deployment and testing.
   - Large-scale data storage.
   - Development environments.
   - On-demand computing for variable workloads.

7. Role in Cloud Models:
   Public clouds provide all service models — IaaS, PaaS, and SaaS — to anyone
   who wants to access them.

8. Providers:
   Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure.

9. Advantages:
   - Very low initial cost (pay only for what you use).
   - No hardware or maintenance responsibilities.
   - Highly scalable — resources can be instantly increased or decreased.
   - Globally accessible from any location.
   - Ideal for startups and small businesses.

10. Disadvantages:
    - Lower security for confidential or regulated data.
    - No dedicated resources — multi-tenant environment.
    - Limited customization compared to private cloud.
    - Potential compliance issues for industries with strict data rules.

    """

    return summary
