Cloud computing

Computers can work over the web.

This is called the cloud.

You can use the cloud from anywhere. You can use a phone or a laptop. It helps you save your work online.

The cloud can grow or shrink. It gives you more help when you need it. It can also give you less.

Many people can use the same tools. This helps friends work together. You can work from far away.

It is like a big, shared tool for everyone.

It makes working easy and fast.

Cloud computing is a way to use computer tools over the internet.

Instead of using just one computer, you use a big group of shared tools. These tools can be stored in many places at once.

There are five main parts to how the cloud works. First, you can get help or storage whenever you need it. This is called on-demand self-service. Second, you can use the cloud from many devices. This includes phones, tablets, and laptops. Third, many people can share the same pool of tools. This is called resource pooling. Fourth, the cloud has rapid elasticity. This means it can grow or shrink very fast to match what you need. Finally, there is measured service. This means the system tracks how much you use.

Companies use different models to work in the cloud. Some give you more control, while others are easier to use. This helps people work together from anywhere in the world. It can also help businesses save money because they only pay for what they use.

Cloud computing is a way to use computer tools over the internet. Instead of relying on just one machine, people use a huge group of shared resources.

This group of tools is often called "the cloud." The International Organization for Standardization defines it as a way to access a pool of resources. These resources can be physical or virtual. This setup lets people get what they need whenever they want it. It is a very important part of how our modern digital world works.

There are five main ways the cloud works. First, it uses on-demand self-service. This means a person can get more storage or server time automatically. They do not need to talk to a person to make it happen. Second, it offers broad network access. You can use the cloud on phones, tablets, or laptops. Third, it uses resource pooling. This is when many people share the same group of tools.

Fourth, it has rapid elasticity. This allows the system to grow or shrink very quickly based on demand. Finally, it uses measured service. The system tracks how much you use, like a meter on a water pipe.

The idea of the cloud has a long history. It started with ideas about time-sharing in the 1960s. During that time, people used a model called a data center. In 1994, a company called General Magic used the "cloud" metaphor. A specialist named David Hoffman is credited with this idea. In 1996, Compaq Computer Corporation used the term in a business plan. They thought online file storage would be a big success.

This helped lead to the cloud services we use today.

Many big companies helped build the cloud we know. Amazon Web Services, or AWS, started in 2002. They released Amazon S3 and EC2 in 2006. In 2008, NASA helped develop open-source software for clouds. Microsoft launched Microsoft Azure in 2010. Other companies like IBM and Oracle joined in later.

In 2019, Amazon launched AWS Outposts to help customers. These different tools allow developers to build things independently.

Cloud computing connects to many things you might already use. It helps people work from anywhere with an internet connection. It also helps businesses save money on big machines. Instead of buying expensive hardware, they pay for what they use.

This is called an operational expenditure model. However, using the cloud can also be a hard job. Some people find it difficult to manage costs or keep data safe. Many organizations now use a hybrid cloud to get the best of both worlds.

Cloud computing is a modern way to access digital resources over a network. The International Organization for Standardization (ISO) defines it as a paradigm for enabling network access to a scalable and elastic pool of resources. These resources can be physical hardware or virtual ones. This system allows for self-service provisioning, which means users can manage resources on demand. Instead of owning a single computer, users tap into a massive, shared pool of computing power.

This flexibility is essential for the modern digital economy.

In 2011, the National Institute of Standards and Technology (NIST) identified five essential characteristics of cloud systems. The first is on-demand self-service, where a consumer can automatically provision server time or storage without human interaction. Second is broad network access, allowing tools to be used on mobile phones, tablets, or laptops. Third is resource pooling, where a provider uses a multi-tenant model to serve many consumers. In this model, different resources are dynamically assigned based on demand.

Fourth is rapid elasticity, which allows the system to scale outward or inward very quickly. Finally, measured service uses metering to monitor and report resource usage, such as bandwidth or storage.

Cloud computing is organized into different service models. These models represent different layers of control and responsibility. Infrastructure as a Service (IaaS) provides the most control to the user over the underlying hardware. Platform as a Service (PaaS) offers more managed tools for developers. Software as a Service (SaaS) provides the least control but the most convenience for the end user.

Under a shared responsibility model, providers handle physical hardware and security updates. However, customers remain accountable for their own data encryption and identity access management.

This balance of responsibility changes depending on which model a company chooses.

The history of these concepts dates back to the 1960s. During that era, time-sharing and remote job entry (RJE) were common. Users would submit jobs to operators to run on large mainframe computers. The specific "cloud" metaphor was used by General Magic in 1994. A communications specialist named David Hoffman is credited with this metaphor. By 1996, Compaq Computer Corporation used the term in a business plan. They believed that online file storage would be a successful commercial venture.

Many major companies have shaped the industry since the early 2000s. Amazon Web Services (AWS) began in 2002 to help developers build applications independently. Amazon released Amazon S3 and Amazon EC2 in 2006. In 2008, NASA developed the first open-source software for private and hybrid clouds. Microsoft launched Azure in 2010, and IBM introduced its SmartCloud framework in 2011. Oracle announced its cloud in 2012. More recently, in 2019, Amazon launched AWS Outposts to extend its infrastructure to customer data centers.

Cloud computing offers a significant value proposition for many organizations. It allows companies to shift from capital expenditures to an operational expenditure (OpEx) model. This means they pay for what they use rather than buying expensive hardware upfront. The cloud also provides access to advanced tools like machine learning and data analytics. However, managing these costs can be difficult. A Gartner survey of 200 IT leaders found that 69% experienced budget overruns in 2023.

To help, many use tools like AWS Cost Explorer to monitor spending.

Despite the benefits, there are notable challenges and limitations to consider. Security and privacy are primary concerns because users must entrust data to third-party providers. Companies must also follow strict regulations like GDPR or HIPAA. Migration is another hurdle, as moving data between environments can be expensive and complex. According to a 2024 Flexera report, 50% of respondents cited challenges like understanding application dependencies. Some industries, such as high-frequency trading, still prefer on-premises systems for ultra-low latency. Many organizations now use a hybrid cloud to balance these needs.