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What Is a Server? A Plain Guide for Small Businesses
A server is a computer whose job is to provide something to other devices on a network: shared files, email, a business application, a database or a website. Any computer can act as a server, but proper server hardware is built to run around the clock, keep working when a part fails and be managed remotely. That is the difference between a box under someone’s desk and the machine a business can rely on.
Key takeaways
- A server serves other devices; a desktop or laptop is used by one person in front of it.
- Server hardware is designed for continuous operation and quick repairs without long downtime.
- Servers come as towers, rack-mounted units and blades.
- Many small businesses run a file server, a domain controller or virtual machines on one physical server.
- Not every business needs its own server; cloud services can cover simple needs.
What does a server actually do?
| Server role | What it does | Typical small business example |
|---|---|---|
| File server | Stores shared files and controls who can open them | A shared drive for accounts and HR documents |
| Domain controller | Manages user logins, passwords and permissions | Active Directory for staff accounts |
| Application or database server | Runs business software that many users access | Accounting, ERP or a point of sale back end |
| Virtualisation host | Runs several virtual servers on one machine | File, print and application servers on one box |
| Backup server | Receives and stores backups from other machines | Nightly copies of every PC and server |
| Web or email server | Hosts websites or mail | An intranet or internal mail relay |
Server vs desktop computer
| Feature | Server | Desktop |
|---|---|---|
| Designed for | 24/7 operation serving many users | Daytime use by one person |
| Memory | ECC memory that detects and corrects errors | Usually non-ECC |
| Power supply | Often two, so one can fail without downtime | One |
| Drives | Hot-swap bays with a RAID controller | One or two internal drives |
| Remote management | Dedicated controller such as Dell iDRAC or HPE iLO | None, or limited |
| Noise | Loud, especially rack units | Quiet |
Types of server hardware
- Tower servers look like a large desktop and run quieter, which suits small offices without a server room.
- Rack servers mount in a standard 19 inch rack and are measured in rack units (U), such as 1U and 2U.
- Blade servers slide into a shared chassis and are mainly used in large data centres.
We compare the first two in detail in rack server vs tower server, and explain U sizes in server rack sizes explained.
What is a dedicated server?
A dedicated server is one physical machine used by a single business, whether it sits in your office or in a data centre. A virtual private server (VPS) is a slice of a larger machine shared with others. Owning the hardware gives you full control and predictable costs, while cloud and VPS options suit businesses that prefer a monthly fee and no hardware to maintain.
Does your business need a server?
| Situation | Usually the better fit |
|---|---|
| A few staff using email and cloud documents | Cloud services, no server needed |
| Shared files, user accounts and permissions for 10 or more staff | An on-premises server |
| Software that must run locally or needs fast local access to data | An on-premises server |
| Several workloads you want to consolidate | One server running virtual machines |
| Strict data location or POPIA requirements | On-premises, or a carefully chosen local provider |
Our guide to choosing the right server for your business walks through processor, memory and storage sizing, and refurbished vs new servers compares the cost of each route. When you are ready to compare models, browse our refurbished servers, including Dell PowerEdge and HPE ProLiant machines.
Frequently asked questions
What is a server in simple terms?
A computer that provides services, such as files, applications or websites, to other computers over a network.
Can a normal PC be used as a server?
Yes, for light jobs such as a small file share. It lacks ECC memory, redundant power and hot-swap drives, so it is less suited to work the business depends on.
What is the difference between a server and the cloud?
The cloud is servers owned and run by a provider and rented as a service. An on-premises server is hardware your business owns and manages.
How long does a server last?
Business servers are built for years of continuous use. Many organisations replace them on a five to seven year cycle, and refurbished servers often have several more years of service left.
In short, a server is the shared engine behind a business network. Knowing which roles you need, and where the hardware will live, is the first step to choosing the right one.