What is on-demand service? How it is provided in cloud computing?
On-demand service refers to the availability of need-based resources in cloud computing. It allows users to avail resources like storage, processing power, or software at a reasonable cost without making a huge investment upfront.
In cloud computing, this service is provided through standard models like Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Users can access hardware, platforms, or application software on a demand basis. Cloud service providers deliver these services over the Internet and charge on a pay per use basis, similar to electricity usage. This enables users to utilize resources without worrying about installation, configuration, or maintenance.
Explanation
The answer is derived from the sections describing cloud computing features and service models. The context explicitly mentions that cloud computing offers 'cost-effective, on-demand resources' where a user can avail 'need-based resources'. It further explains that these services are provided through IaaS, PaaS, and SaaS models, allowing users to outsource hardware and software on a demand basis and pay per usage, eliminating the need for huge upfront investments.
Solution Steps
Step 1: Define on-demand service using the context phrases 'need-based resources' and 'cost-effective'.
Step 2: Explain the provision of service by listing the three standard models (IaaS, PaaS, SaaS) mentioned in the text.
Step 3: Describe the financial model ('pay per use basis') and the benefit (eliminating upfront investment) as detailed in the context.