Overview
Direct Answer
Infrastructure as a Service is a cloud computing model delivering virtualised computing resources—including servers, storage, networking, and virtualisation—as on-demand services over the internet. Customers provision and manage these resources without owning or maintaining physical hardware.
How It Works
A cloud provider operates shared physical infrastructure in data centres and abstracts it into logical pools accessible via APIs or web consoles. Customers instantiate virtual machines, allocate storage volumes, and configure networks on demand, paying only for consumption. The provider handles hardware maintenance, redundancy, and infrastructure security whilst the customer maintains responsibility for operating systems, middleware, and applications.
Why It Matters
IaaS eliminates capital expenditure on servers and reduces operational overhead, enabling organisations to scale capacity elastically with business demand. This model accelerates deployment cycles and allows teams to focus engineering effort on applications rather than infrastructure procurement and maintenance.
Common Applications
Development and testing environments, web application hosting, batch processing workloads, and disaster recovery solutions commonly utilise this model. Enterprise organisations deploy business applications, whilst startups use it to avoid upfront infrastructure investment.
Key Considerations
Organisations must manage security at the application and data layers whilst relying on provider security for the underlying infrastructure. Network latency, data residency compliance, and vendor lock-in warrant careful evaluation during adoption planning.
Cross-References(1)
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