Public Cloud refers to the cloud computing model with which the IT services are delivered across the Internet. The service may be free, freemium or a subscription-based offering charged based on the compute resources consumed. The compute functionality may range from common services such as email, apps and storage to the enterprise-grade OS platform or infrastructure environments used for software development and testing. The cloud vendor is responsible for developing, managing and maintaining the pool of computing resources shared between multiple tenants from across the network.
The defining features of a public cloud environment include high elasticity and scalability for IT-enabled services delivered at a low-cost subscription-based pricing tier. As the most popular model of cloud computing services, the public cloud offers vast choices in terms of solutions and compute resources to address the growing needs of organisations of all sizes and verticals.
Advantages of public cloud:
- No investments required to deploy and maintain the IT infrastructure.
- High scalability and flexibility to meet unpredictable workload demands.
- Reduced complexity and requirements on IT expertise as the cloud vendor is responsible to manage the infrastructure.
- Flexible pricing options based on different Service Level Agreement (SLA) offerings.
- The cost agility allows organisations to follow lean growth strategies and focus their investments on innovation projects.
Suitable choice for:
- Predictable computing needs, such as communication services for a specific number of users.
- Apps and services necessary to perform IT and business operations.
- Additional resource requirements to address varying peak demands.
- Software development and test environments.
Limitations:
- The total cost of ownership (TCO) can rise exponentially for large-scale usage, specifically for midsize to large enterprises.
- Not the most viable solution for security and availability sensitive mission-critical IT workloads.
- Low visibility and control into the infrastructure, which may not suffice to meet regulatory compliance.
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