What is Cloud Computing?

What is Cloud Computing?

Cloud computing is the delivery of on-demand computing services, database storage from applications to storage and processing power typically over the internet and on a pay-as-you-go basis. Cloud computing enables companies to consume a compute resource, such as a virtual machine, storage or an application, as a utility just like electricity rather than having to build and maintain computing infrastructures in house.

History of cloud computing

Cloud computing traces its origins back to the 1960s, when the computer industry recognized the potential benefits of delivering computing as a service or a utility. However early computing lacked the connectivity and bandwidth needed to implement computing as a utility. It was not until the broad availability of internet bandwidth in the late 1990s that computing as a service became practical. In the late 1990s, Sales-force offered one of the first commercially successful implementations of enterprise SaaS. This was followed closely by the arrival of AWS in 2002, offering a range of services, including storage and computation -- and now embracing databases, machine learning and other services. Today, Microsoft Azure, Google Cloud Platform and other providers have joined AWS in providing cloud-based services to individuals, small businesses and global enterprises.

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How does cloud computing work?

Rather than owning their own computing infrastructure or data centers, companies can rent access to anything from applications to storage from a cloud service provider. One benefit of using cloud computing services is that firms can avoid the upfront cost and complexity of owning and maintaining their own IT infrastructure, and instead simply pay for what they use, when they use it. In turn, providers of cloud computing services can benefit from significant economies of scale by delivering the same services to a wide range of customers.

Cloud computing characteristics and benefits

Cloud computing boasts several attractive benefits for businesses and end users. Five of the main benefits of cloud computing:

Self-service provisioning: End users can spin up compute resources for almost any type of workload on demand. This eliminates the traditional need for IT administrators to provision and manage compute resources.

Pay per use: Compute resources are measured at a granular level, enabling users to pay only for the resources and workloads they use.

Elasticity: Companies can scale up as computing needs increase and scale down again as demands decrease. This eliminates the need for massive investments in local infrastructure, which may or may not remain active.

Migration flexibility: Organizations can move certain workloads to or from the cloud or to different cloud platforms as desired or automatically for better cost savings or to use new services as they emerge.

Workload resilience: Cloud service providers often implement redundant resources to ensure resilient storage and to keep user`s important workloads running often across multiple global regions.

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Cloud computing deployment models

Cloud computing services can be private, public or hybrid.

Private cloud services are delivered from a business's data center to internal users. This model offers the versatility and convenience of the cloud, while preserving the management, control and security common to local data centers. Internal users may or may not be billed for services through IT charge-back.

Common private cloud technologies and vendors include VMware and OpenStack.

In the public cloud model, a third-party cloud service provider delivers the cloud service over the internet. Public cloud services are sold on demand, typically by the minute or hour, though long-term commitments are available for many services. Customers only pay for the CPU cycles, storage or bandwidth they consume. Leading public cloud service providers include Amazon Web Services (AWS), Microsoft Azure, IBM and Google Cloud Platform.

A hybrid cloud is a combination of public cloud services and an on-premises private cloud, with orchestration and automation between the two. Companies can run mission-critical workloads or sensitive applications on the private cloud and use the public cloud to handle workload bursts or spikes in demand.

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The goal of a hybrid cloud is to create a unified, automated, scalable environment that takes advantage of all that a public cloud infrastructure can provide, while still maintaining control over mission-critical data.

Types of cloud computing services

Although cloud computing has changed over time, it has been divided into three broad service categories: infrastructure as a service, platform as a service and software as a service. IaaS providers, such as AWS, supply a virtual server instance and storage, as well as APIs that enable users to migrate workloads to a VM. Users have an allocated storage capacity and can start, stop, access and configure the VM and storage as desired. IaaS providers offer small, medium, large, extra-large and memory- or compute-optimized instances, in addition to customized instances, for various workload needs.

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In the PaaS model, cloud providers host development tools on their infrastructures. Users access these tools over the internet using APIs, web portals or gateway software. PaaS is used for general software development, and many PaaS providers host the software after it's developed. Common PaaS providers include Salesforce's Force.com, AWS Elastic Beanstalk and Google App Engine. SaaS is a distribution model that delivers software applications over the internet; these applications are often called web services. Users can access SaaS applications and services from any location using a computer or mobile device that has internet access. One common example of a SaaS application is Microsoft Office 365 for productivity and email services.

Emerging cloud technologies and services

Cloud providers are competitive, and they constantly expand their services to differentiate themselves. This has led public IaaS providers to offer far more than common compute and storage instances.

For example, server-less, or event-driven computing is a cloud service that executes specific functions, such as image processing and database updates. Traditional cloud deployments require users to establish a compute instance and load code into that instance. Then, the user decides how long to run-and pay for that instance. With server-less computing, developers simply create code, and the cloud provider loads and executes that code in response to real-world events, so users don't have to worry about the server or instance aspect of the cloud deployment. Users only pay for the number of transactions that the function executes. AWS Lambda, Google Cloud Functions and Azure Functions are examples of server-less computing services. Public cloud computing also lends itself well to big data processing, which demands enormous compute resources for relatively short duration. Cloud providers have responded with big data services, including Google Big-query for large-scale data warehousing and Microsoft Azure Data Lake Analytics for processing huge data sets. Another crop of emerging cloud technologies and services relates to artificial intelligence (AI) and machine learning. These technologies build machine understanding, enable systems to mimic human understanding and respond to changes in data to benefit the business. Amazon Machine Learning, Amazon Lex, Amazon Polly, Google Cloud Machine Learning Engine and Google Cloud Speech API are examples of these services.

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Cloud computing security

Security remains a primary concern for businesses contemplating cloud adoption -- especially public cloud adoption. Public cloud service providers share their underlying hardware infrastructure between numerous customers, as public cloud is a multi-tenant environment. This environment demands copious isolation between logical compute resources. At the same time, access to public cloud storage and compute resources is guarded by account login credentials.

Many organizations bound by complex regulatory obligations and governance standards are still hesitant to place data or workloads in the public cloud for fear of outages, loss or theft. However, this resistance is fading, as logical isolation has proven reliable, and the addition of data encryption and various identity and access management tools has improved security within the public cloud.

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