---
title: "What Is IaaS? Infrastructure as a Service | Bytes Unlimited"
description: "IaaS (Infrastructure as a Service) gives you cloud-hosted virtual machines, storage, and networking on demand. AWS EC2, Google Compute Engine, Azure VMs — the building blocks of cloud computing."
canonical: https://www.bytesunlimited.com/glossary/iaas/
---

 GLOSSARY · Cloud 

#  Infrastructure as a Service IaaS 

 Cloud-hosted virtual machines, storage, and networking that you rent by the hour or month — you manage the operating system and applications on top. 

## Detailed definition

**Infrastructure as a Service** is the cloud layer that gives you the raw building blocks — virtual machines, block storage, virtual networks, load balancers — on demand, billed by the hour or by usage. You’re still responsible for the operating system, the runtime, and the application; the cloud provider is responsible for the physical hardware, the hypervisor, and the network underneath.

## What IaaS covers

A typical IaaS account includes:

* **Compute** — virtual machines (AWS EC2, Google Compute Engine, Azure VMs) sized from tiny (2 vCPU, 4 GB RAM) to massive (hundreds of cores, terabytes of RAM)
* **Storage** — block storage attached to VMs, object storage (S3, GCS) for files and backups, archival tiers for cold data
* **Networking** — virtual networks, load balancers, VPN gateways, private connectivity to on-prem
* **Identity and access management (IAM)** — fine-grained permissions on every resource

## IaaS vs PaaS vs SaaS — the spectrum

| Layer                        | You manage       | Vendor manages                | Example               |
| ---------------------------- | ---------------- | ----------------------------- | --------------------- |
| On-prem                      | Everything       | Nothing                       | Server in your closet |
| IaaS                         | OS, runtime, app | Hardware, hypervisor, network | AWS EC2               |
| PaaS (Platform as a Service) | App + data       | Everything else               | Heroku, App Engine    |
| [SaaS](/glossary/saas/)      | Just your data   | Everything                    | Google Workspace      |

As you move down the stack, you give up control and gain operational simplicity. Most modern SMB cloud deployments use a mix — IaaS for custom workloads, PaaS for managed databases, SaaS for productivity and most business apps.

## When IaaS is the right answer

* You need full OS control (custom kernel, niche software, regulatory requirements)
* You have a non-cloud-native application you’re migrating (lift-and-shift)
* You need geographic flexibility or hybrid connectivity
* You want to optimize cost via reserved capacity or savings plans

For most SMB workloads we recommend SaaS first, PaaS second, IaaS only when those don’t fit. The operational cost of running IaaS yourself adds up fast — patching, monitoring, backup, scaling — and the cloud provider doesn’t do that work for you at this layer. See the [Cloud & AWS service page](/services/cloud-aws/) for our approach.

HOW WE HELP

## Related Bytes Unlimited services

* [ Cloud & AWS AWS architecture, migration, and ongoing optimization. Right-sized infrastructure that scales with the business.](/services/cloud-aws/)
* [ Google Cloud Google Cloud Platform — Compute Engine, Cloud Storage, IAM, and BigQuery setup for SMBs and dev teams.](/services/google-cloud/)

RELATED TERMS

## See also

* [ SaaS ](/glossary/saas/)

##  Need help applying IaaS to your business? 

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[ Get In Touch ](/contact/) [ Back to Glossary ](/glossary/)

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