What 

In common terms cloud computing means that you can access a secured and safe platform (internet) for your Data, and where you get all computer system resources over the internet (cloud),which includes services like storage database, networking, software and analytics.

The cloud computing services works on the principle of pay-as-you-use, it means that you only have to pay for the resources you use and doesn't need to pay for what you don't use.

Types of Cloud Services

There are different types of cloud services which work to solve different problems. There are three main types:

• Infrastructure as a service (IaaS)
• Platform as a service (PaaS)
• Software as a service (SaaS)

Infrastructure as a service (IaaS)

In the IaaS model, the cloud providers supply infrastructure as their services to IT such as storage, server and networking resources, and delivers them to subscriber organisations to virtual machines accessible on the internet.

 IaaS can have many benefits for organisations, such as potentially making workloads faster, easier, flexible and cost efficient.IaaS providers also supply a range of services to accompany those infrastructure components. These includes the following:

• detailed billing
• monitoring
• log access
• security
• load balancing
• storage resiliency, such as backup, replication and recovery.

Platform as a service(Paas)

PaaS is a complete development and deployment environment in the cloud, with resources that enable you to deliver everything from simple cloud-based apps to complex one. You purchase the resources you need from a cloud service provider on a pay-as-you-go basis and access them over a secure Internet.

Just like IaaS, PaaS includes infrastructure—servers, networking and storage —but also development tools, database management systems and more. PaaS is designed to support the complete web application lifecycle: building, testing, deploying, managing and updating.

PaaS allows you to avoid the expense and complexity of buying and managing software license, the underlying application infrastructure or the development tools and other resources.

Other PaaS services includes:

• Development team collaboration
• Application design and development
• Application testing and deployment
• Web service integration
• Information security

Software as a service (SaaS)

SaaS works through the cloud software licensing and delivery model. In SaaS a software provider will either host the application and related data, or it may be an ISV (Independent Software Vendor) that contracts a cloud provider to host the application in the provider's data center. 

The application will be accessible to any device with a network connection. Typically a SaaS applications can be accessed through web browsers.

We have looked through at some most important cloud services like IaaS,PaaS and SaaS. Alongside these services there are some of the types of cloud services which has much uses in IT sectors like:

• Desktop as a service(DaaS)
• managed software as a service(MSaaS)
• mobile backend as a service(MBaaS)
• data center as a service(DCaaS)
• Information technology management as a service (ITMaaS)

Who provides us cloud services

The companies which provides you or offer on-demand cloud computing components like IaaS, PaaS, and SaaS, are called cloud providers. Let's have look to some most recognised companies like

Microsoft azure:

Google cloud:

Google Cloud Platform,by Google, that runs on the same infrastructure that Google uses internally for its end-user products, such as Gmail, file storage, and YouTube. 

Google Cloud Platform provide services for compute, storage, networking, big data, machine learning, as well as cloud management, security and developer tools. The core cloud computing products in Google Cloud Platform include- Google Compute Engine, Google App Engine,Google Coud Storage and Google Container Engine.  

IBM Cloud:

IBM cloud is a set of cloud computing services for business by the IT company IBM. IBM Cloud includes same infrastructure as other cloud providers does, like  IaaS, SaaS and PaaS offered through public, private and hybrid cloud delivery models, in addition to the components that make up those clouds.

One of the notable feature of IBM cloud is that,users can build their own private cloud or purchase services hosted on the IBM cloud. Users may also purchase IBM hardware, software and services to build their customized cloud environment.

Amazon Web Services:

Amazon Web Services (AWB) is kind of segment of Amazon,which provides on demand cloud computing platform to individuals, company, and Government.AWB also charges in the same way pay-as-you-use model.

The AWS technology is implemented at server farms throughout the world, and maintained by the Amazon . Fees are based on a combination of usage, hardware, operating system, software, or networking features chosen by the client's required availability, redundancy, security, and service options. Client can pay for a single virtual AWS computer, a dedicated physical computer, or clusters of either. As part of the subscription agreement, Amazon provides security for client's systems.

Future of Cloud computing

The future of cloud computing is likely to expand in coming future and advances in processing capability, fueled by quantum computing and artificial intelligence, as well as expansion of cloud adoption. 

Large and small businesses are likely to create more hybrids of public and private clouds. Low-code and no-code platforms will continue to democratize technology and empower citizen developers to create apps that solve their own problems, without having to hire programmers.