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)
More in Cloud Computing
Cloud Database
Strategy & EconomicsA database service built, deployed, and accessed through a cloud platform, offering scalability and managed operations.
Auto-Scaling
InfrastructureAutomatically adjusting compute resources based on current demand to maintain performance and optimise costs.
Spot Instances
Service ModelsSpare cloud computing capacity offered at steep discounts compared to on-demand pricing, available when the provider has excess resources but subject to interruption.
Sovereign Cloud
Strategy & EconomicsCloud infrastructure operated within national boundaries under local jurisdiction, ensuring data sovereignty, regulatory compliance, and protection from foreign government access.
Region
InfrastructureA geographic area containing one or more data centres where cloud services are hosted.
Terraform
Deployment & OperationsAn open-source infrastructure as code tool for building, changing, and versioning infrastructure safely and efficiently.
Cloud Governance
Strategy & EconomicsThe policies, procedures, and tools for managing cloud resource usage, security, compliance, and costs.
Pub/Sub
Architecture PatternsA messaging pattern where publishers send messages to topics and subscribers receive messages from topics of interest.