Public Cloud

Public cloud computing, including cloud hosting, is a model that provides on-demand access to a shared pool of computing resources over the Internet. It offers flexibility, scalability, and cost-efficiency that has redefined how businesses and individuals manage their digital infrastructure.

Key characteristics

Public cloud computing exhibits several key characteristics that set it apart from other computing models. Understanding these characteristics is essential for grasping the core principles of public cloud technology: 

Scalability

One of the standout features of public cloud services is their unparalleled scalability. In a public cloud environment, users can effortlessly scale their computing resources up or down according to their needs. Whether you're a startup requiring minimal resources or a large enterprise managing intense workloads, the public cloud allows you to adapt without the traditional physical infrastructure constraints.

Accessibility

Public cloud services are designed with accessibility in mind. Users can access their applications, data, and resources virtually anywhere via the Internet. This accessibility fosters collaboration among distributed teams, enables remote work, and facilitates global reach for businesses of all sizes. 

Multi-tenancy

Public clouds are inherently multi-tenant environments, meaning multiple users or organisations share the same underlying infrastructure and resources. This shared model optimises resource utilisation and cost-efficiency, as users pay only for the resources they consume. However, it also necessitates robust security and isolation mechanisms to ensure data privacy and prevent unauthorised access. 

Benefits of public cloud

Embracing public cloud services offers many advantages that have revolutionised how businesses and individuals approach their computing needs. Let's explore some of the primary benefits of leveraging the public cloud: 

• Cost-efficiency: Public cloud computing can significantly reduce capital expenditures by eliminating the need for on-premises hardware and infrastructure. Users pay for resources on a pay-as-you-go basis, meaning they only incur costs for the computing power, storage, and services they use. This cost-efficiency benefits startups and small businesses looking to minimise initial investment while enjoying access to enterprise-grade infrastructure.

• Flexibility: Public cloud providers offer vast services and configurations, allowing users to tailor their cloud environments to specific requirements. Whether you need additional computing power for a seasonal spike in demand or wish to experiment with cutting-edge technologies, the public cloud provides the flexibility to adapt swiftly.

• Reliability: Leading public cloud providers are known for their high uptime and reliability. They operate data centres across multiple geographic regions, ensuring redundancy and fault tolerance. This reliability translates into improved service availability and minimises disruptions critical for mission-critical applications and services.

• Security: While security concerns are common in the cloud, reputable public cloud providers invest heavily in robust security measures. They implement encryption, identity and access management, and continuous monitoring to safeguard data. It's crucial, however, for users to understand the shared responsibility model, where cloud providers secure the infrastructure while users are responsible for securing their applications and data within the cloud.

The combination of cost savings, flexibility, reliability, and security makes the public cloud attractive for organisations of all sizes.

Public Cloud service models

Several service models exist in public cloud computing, each catering to different user needs and levels of control. Understanding these service models is essential for organisations when deciding how to leverage the public cloud best:

Infrastructure as a Service (IaaS)

IaaS is the foundational layer of public cloud services. In this model, users access virtualised computing resources over the Internet. These resources typically include virtual machines, storage, and networking. IaaS provides users with the highest level of control, allowing them to manage and customise their virtual infrastructure while the cloud provider handles the underlying hardware. 

Platform as a Service (PaaS)

PaaS takes cloud abstraction further by providing a platform and runtime environment for developing, deploying, and managing applications. With PaaS, users can focus on coding and application logic, leaving the cloud provider's management of infrastructure, databases, and scalability. This model streamlines application development and reduces the operational burden.

Software as a Service (SaaS)

SaaS represents the most user-friendly cloud service model, offering ready-to-use software applications delivered online. Users access these applications via web browsers, eliminating the need for installation and maintenance. Examples include email services like Gmail, collaboration tools like Microsoft 365, and customer relationship management (CRM) software like Salesforce. 

Popular public cloud providers

In the rapidly expanding landscape of public cloud services, several industry giants have emerged, each offering various resources and tools to meet the diverse needs of organisations and individuals. Let's take a closer look at some of the most prominent public cloud providers:

Amazon Web Services (AWS)

AWS, provided by Amazon, is a global leader in public cloud services. It offers a comprehensive suite of computing, storage, machine learning, and networking resources. AWS's extensive network of data centres spans the globe, making it a top choice for organisations seeking global reach and scalability.

Microsoft Azure

Microsoft's Azure platform provides broad services and tools for building, deploying, and managing applications and services. Azure's seamless integration with Microsoft products like Windows Server, SQL Server, and Active Directory makes it a favoured choice for enterprises invested in the Microsoft ecosystem. 

Google Cloud Platform (GCP)

Google Cloud is known for its expertise in data analytics, machine learning, and containerisation technologies. GCP offers containerisation services like Kubernetes for container orchestration and services like BigQuery for data analytics. It's a preferred option for organisations seeking innovative solutions for data-intensive tasks.

IBM Cloud

IBM Cloud focuses on hybrid and multi-cloud environments, catering to enterprises with specific regulatory and compliance requirements. It provides services like IBM Watson for AI and analytics and offers a range of cloud deployment options, including public, private, and hybrid.

Oracle Cloud

Oracle Cloud offers a comprehensive suite of cloud services focusing on database solutions. It's favoured by organisations relying heavily on Oracle databases and applications, providing seamless integration and optimisation for Oracle workloads.