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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesNetwork functions virtualization (NFV) is the principle of separating network functions from the hardware they run on by using virtualization techniques. In practice, that means a function such as routing, firewalling or load balancing no longer has to be bound to a dedicated appliance. It can run as network software on a shared, virtualized infrastructure.
The definition comes from the European Telecommunications Standards Institute (ETSI), which publishes the main NFV reference work. It is stated in ETSI GR NFV 003 V1.6.1 (2021-03), the group’s terminology report, and this article follows that wording.
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What the definition means
Each part of the ETSI wording carries a specific meaning, and the phrase is easy to misread if one part is skipped.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →- Network function. A network function is a functional block with defined external interfaces and behavior. Routing, packet filtering and session border control are all examples of functions in this sense. The term describes what the block does, not the box it sits in.
- Separation from hardware. In a traditional design, a function is shipped and sold as a combined unit of specialized hardware and software. NFV splits the two, so the software can be deployed on general-purpose or shared computing resources.
- Virtualization techniques. The separation is achieved by an abstraction layer that presents compute, storage and networking resources to the software in a uniform way. The ETSI architecture framework (ETSI GS NFV 002 V1.1.1, 2013-10) describes this virtualization layer as the piece that decouples VNF software from the underlying hardware.
NFV is therefore a way of implementing network functions. It is not a single product, a single appliance or a single vendor offering.
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The core terms
NFV discussions use four terms that are often mixed up. The table below sets out what each one refers to.
| Term | What it refers to | Plain-language role |
|---|---|---|
| Network function (NF) | A functional block with defined external interfaces and behavior | The job the network has to do |
| Virtualized network function (VNF) | An implementation of a network function running in an NFV environment | The software that does the job |
| NFV infrastructure (NFVI) | The totality of hardware and software components where VNFs are deployed | The environment the software runs in |
| NFV management and orchestration (NFV-MANO) | The group of functions that manage the lifecycle of VNFs and allocate infrastructure resources | The control layer that starts, scales, and coordinates the software |
Use “VNF” when you mean a specific software implementation of a function. Avoid using “NFV” as a synonym for a VNF, because NFV is the approach and the VNF is one of its components.
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The three MANO components
NFV-MANO groups three functional blocks, each with a distinct role:
- NFV orchestrator. Coordinates network-service and VNF lifecycle management, and the allocation of infrastructure resources across services.
- VNF manager. Handles the lifecycle of individual VNF instances.
- Virtualized infrastructure manager (VIM). Controls and manages the compute, storage and networking resources of the NFVI.
How the pieces work together
The following sequence describes the normal flow of an NFV deployment, as the ETSI framework lays it out.
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- The infrastructure supplies resources. Compute, storage and networking resources form the NFVI.
- The virtualization layer abstracts them. It decouples the VNF software from the specific hardware underneath, which is what makes the VNF lifecycle hardware-independent.
- VNFs run on top. Each network function is deployed as software instances on that abstracted infrastructure.
- MANO coordinates. The orchestrator, VNF manager and VIM work together to create, scale, and retire VNF instances and to allocate the resources they use.
For learning purposes, many explanations reduce this to three concepts: NFVI as the environment, VNFs as the software functions, and NFV-MANO as lifecycle management. That shorthand is an editorial simplification. The full ETSI framework contains additional functional blocks and interfaces that this article does not cover.
Where NFV is used
ETSI’s use-case report, ETSI GR NFV 001 V1.3.1 (2021-05), groups NFV scenarios into five categories:
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- 【Plug and Play】Easy setup with no software installation or configuration needed
- 【Ethernet Splitter】Connect to your router or modem for additional wired connections (laptop, gaming console, printer, etc)
- NFV technology scenarios. Scenarios focused on the technology itself, such as how NFV components are combined.
- Telecom network uses. Typically, a telecom provider virtualizes its network elements and combines VNFs into services for its customers.
- NFV consumer uses. Includes enterprise deployments and scenarios that require new network capabilities.
- General services. Uses that are not specific to telecom or enterprise networks.
- Operations. Scenarios about how networks are run and managed once NFV is in place.
Software-based routing, firewalling and load balancing are familiar examples of network functions that can be virtualized. The ETSI use-case excerpts reviewed here do not list these examples by name, so treat them as illustrations of the concept rather than as a catalogue from the standard.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteNFV and SDN
NFV and software-defined networking (SDN) are related but distinct. A common introductory distinction is that NFV virtualizes network functions, while SDN changes how network control is organized. Beyond that broad distinction, this article does not make a detailed comparison, because a rigorous one needs primary-source support that is not covered here.
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What NFV is not
NFV describes an architectural approach, so comparing real NFV implementations is a different exercise from reading the definition. The axes that usually matter in such comparisons are:
- the virtualization and runtime model used to host VNFs;
- infrastructure and network performance requirements;
- the degree of lifecycle automation;
- interoperability with orchestration systems;
- who is responsible for operating the environment.
No performance, cost or adoption figure is attached to the definition itself. Those numbers depend on the specific deployment, and none of them is established in the sources behind this article.
Current direction of the standards
ETSI’s NFV group page, checked in early October 2026, describes ongoing work on cloud-native and containerized network functions. At that date it also listed NFV Release 5 and Release 6 specifications published in 2026. Release numbering and dates change, so check the ETSI NFV group page for the current list before relying on a specific release.
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