What Are Azure Cloud Services Types?

Azure Cloud Service Types Explained: IaaS, PaaS, and SaaS

Azure offers three cloud service delivery models: IaaS (Infrastructure as a Service), PaaS (Platform as a Service), and SaaS (Software as a Service). Each gives you a different level of control vs. Microsoft-managed services. This guide explains each type, the most important Azure services in each category, and how to choose for enterprise workloads.

Key facts

• IaaS gives you full VM control. PaaS abstracts the OS. SaaS abstracts everything — you use the application only.
• Azure holds 24% of global cloud infrastructure market share in 2026.
• Azure Reserved Instances save 40–72% on compute vs. pay-as-you-go pricing.
• Azure Hybrid Benefit saves an additional 40–49% for organizations with existing Windows Server and SQL Server licenses.
• Enterprise-scale Azure landing zones now deploy in 4–7 days vs. 6–12 weeks with manual provisioning.
• EPC Group has completed hundreds of enterprise Azure implementations over 29 years.

IaaS — Infrastructure as a Service

IaaS provides virtualized computing infrastructure over the internet. You manage the operating system and everything above it. Microsoft manages the physical hardware.

• Azure Virtual Machines — Windows and Linux VMs. You control OS patching, configurations, and installed software.
• Azure Disk Storage — Managed disks for VM storage. Premium SSD, Standard SSD, and HDD options.
• Azure Virtual Network (VNet) — Private network in Azure. Controls IP addressing, subnets, routing, and security groups.
• Azure Load Balancer — Distributes traffic across VMs. Layer 4 (transport layer) load balancing.
• Azure Backup — VM backup and restore. Supports Windows and Linux workloads.

Best for: Lift-and-shift migrations, custom OS configurations, legacy application hosting, and workloads requiring full OS control.

PaaS — Platform as a Service

PaaS provides a managed platform for application development and deployment. You manage your application and data. Microsoft manages the OS, runtime, and infrastructure.

• Azure App Service — Managed web app and API hosting. Supports .NET, Node.js, Python, Java, PHP.
• Azure SQL Database — Fully managed SQL Server in the cloud. Automatic patching, backups, and scaling.
• Azure Kubernetes Service (AKS) — Managed Kubernetes for containerized workloads. Microsoft manages the control plane.
• Azure Functions — Serverless compute. Pay only for execution time. No server management.
• Azure Service Bus — Managed message queuing for distributed application architectures.

Best for: New application development, microservices, APIs, and organizations wanting faster development without infrastructure management overhead.

SaaS — Software as a Service

SaaS delivers fully managed software applications over the internet. Microsoft manages everything — infrastructure, platform, and application. You configure and use it.

• Microsoft 365 — Exchange Online, SharePoint Online, Teams, OneDrive. Subscription-based office productivity suite.
• Microsoft Dynamics 365 — ERP and CRM SaaS applications. Finance, Supply Chain, Sales, Customer Service.
• Microsoft Fabric — Unified analytics SaaS platform. Data engineering, warehousing, and Power BI.
• Microsoft Copilot (M365) — AI productivity layer on top of Microsoft 365 SaaS applications.
• Azure DevOps — SaaS DevOps platform. Repos, pipelines, boards, and test plans.

Best for: Standard business applications (email, collaboration, CRM, ERP) where customization at the OS level is not required.

IaaS vs. PaaS vs. SaaS — Which to Choose?

Use this decision framework for enterprise workload placement.

• Existing application, no code change possible → IaaS. Lift and shift to Azure VMs.
• New application development → PaaS. Use App Service, AKS, or Azure Functions.
• Standard business software → SaaS. Use M365, Dynamics 365, or Microsoft Fabric.
• High compliance workload (HIPAA, FedRAMP) → IaaS or PaaS with explicit compliance configuration. SaaS with BAA/BAA execution where applicable.
• Cost optimization priority → PaaS and SaaS reduce operational overhead vs. IaaS.

Azure Cost Optimization

Azure spend is manageable when governed with FinOps practices. Three cost levers deliver the highest savings.

• Azure Reserved Instances — 1-year or 3-year compute commitments save 40–72% vs. pay-as-you-go pricing on predictable VM workloads.
• Azure Savings Plans — Extend Reserved Instance discounts to compute portability across instance families.
• Azure Hybrid Benefit — Bring your own Windows Server and SQL Server licenses. Saves an additional 40–49% on compute costs.

Azure Landing Zone

An Azure Landing Zone is a pre-configured environment with networking, identity, security, and governance ready before workloads arrive. The enterprise-scale landing zone deploys in 4–7 days using Bicep or Terraform automation.

• Management groups — organizational hierarchy for policy and RBAC inheritance.
• Hub-spoke networking — centralized hub VNet with spoke VNets per workload.
• Azure Policy initiative assignments — enforce compliance controls at scale.
• Azure Monitor and Log Analytics — centralized logging and alerting.
• Microsoft Sentinel — SIEM for security monitoring across the entire tenant.

Frequently asked questions

What are the three Azure cloud service types?

IaaS (Infrastructure as a Service), PaaS (Platform as a Service), and SaaS (Software as a Service). IaaS gives you VM-level control. PaaS manages the OS and runtime. SaaS delivers fully managed software applications.

What is Azure IaaS?

Azure IaaS provides virtualized computing infrastructure — Virtual Machines, managed disks, Virtual Networks, and Load Balancers. You control the OS and application. Microsoft manages the physical hardware and hypervisor.

What is Azure PaaS?

Azure PaaS provides managed application development platforms — App Service, Azure SQL Database, Azure Kubernetes Service, Azure Functions. You manage your application. Microsoft manages the OS, runtime, and underlying infrastructure.

How much does Azure cost?

Azure costs depend on service type, region, and usage pattern. Azure Reserved Instances reduce compute costs by 40–72%. Azure Hybrid Benefit adds another 40–49% savings for existing Windows Server and SQL Server license holders.

Does EPC Group help with Azure architecture?

Yes. EPC Group designs Azure architectures, deploys enterprise-scale landing zones, and performs cloud migrations for healthcare (HIPAA), financial services (SOC 2), and government (FedRAMP) organizations. Engagements start at $25,000 for Azure assessments.

Schedule an Azure architecture review

Talk to an EPC Group Azure architect about your cloud service design, landing zone, or migration project. Call (888) 381-9725 or request a 30-minute discovery call.