Computer security, IT security, cyber security, there are plenty of terms to get your head around. They are often used to mean the same thing, but there are some differences.
Computer security is about protecting individual computers, devices and the information stored on them. Cyber security takes a wider view. It covers your email, network, cloud services, user accounts and the way people access business information.
Both are important. After all, there is little point securing a laptop if the email account used on it is easy to access or an old employee can still log in to company files.
What is computer security?
Put simply, computer security means protecting your computers and the information held on them.
That might involve keeping software updated, installing antivirus protection and making sure a computer locks when somebody steps away from it. It also includes controlling who can use each device and backing up the files stored on it.
Good computer security for business should cover every device your team uses for work. That could include office computers, laptops, company mobiles and personal devices that have permission to access business systems.
It is a good starting point, but it does not cover every way somebody might try to get into your business.
What is cyber security?
Cyber security looks at your whole digital setup rather than one computer at a time.
It covers the systems your business depends on, from Microsoft 365 and email to cloud applications, Wi-Fi, networks and backups. It also considers how your team signs in, who can access what and what happens when something looks suspicious.
An attack does not always start with a criminal trying to “hack” a computer. It may begin with a fake Microsoft login page or an urgent email that appears to be from the boss. It could be an old account that nobody remembered to close.
This is why cyber security in business is as much about good day-to-day habits as it is about security software.
What is the difference between computer security and cyber security?
The main difference is how much they cover.
Computer security focuses on protecting a particular device and the information stored on it. Cyber security includes that device, but also looks at the wider business network, online accounts and the people using them.
For example, antivirus software can help stop malware from infecting a laptop. It cannot always stop somebody from entering their password into a convincing fake website.
Reducing that risk may also involve multi-factor authentication, email filtering and giving employees an easy way to check or report an unusual message.
The two areas work together. Strong computer security forms part of a wider business cyber security plan.
Why is cyber security important for small businesses?
Small businesses sometimes assume they are unlikely to be targeted because there are bigger companies out there. Unfortunately, cyber criminals do not always choose a business by size. Often, they are simply looking for an easy way in.
Small businesses still hold plenty of useful information. Customer details, employee records, invoices, bank information and access to other organisations can all be valuable.
The Government’s Cyber Security Breaches Survey 2025/2026 found that 46% of small businesses had identified a cyber security breach or attack in the previous 12 months. Phishing was still the most common type of attack across UK businesses. View the Cyber Security Breaches Survey 2025/2026
A cyber incident can also be particularly disruptive for a smaller team. If email, files or business systems suddenly become unavailable, there may not be an in-house IT department ready to deal with it. Somebody has to stop doing their normal job and work out what has happened.
Good cyber security helps lower that risk and gives you a clearer plan if something does go wrong.
Common cyber security threats for small businesses
Phishing emails and fake messages
Most of us know not to trust an email from a mysterious prince offering us a fortune. The difficult ones are the messages that look completely normal.
A phishing email might copy the branding of Microsoft, a bank or one of your suppliers. It may ask somebody to sign in, open a document or deal with an urgent payment.
The safest approach is to pause and check. If a message asks you to log in, visit the service through your usual bookmark or type the address yourself rather than following the link.
Stolen passwords
Reusing passwords makes life easier until one of them is exposed.
If the same login details are used for several services, a criminal may be able to move from one account to another. Access to a business email account can be particularly useful because it allows them to read conversations and send believable messages to colleagues, customers and suppliers.
Impersonation and payment fraud
Sometimes the attacker is not trying to install anything. They simply want somebody to believe they are a director, colleague or supplier.
They might request an urgent bank transfer or say that payment details have changed. Agreeing a separate check for unusual payments or account changes can prevent a convincing email from becoming an expensive mistake.
Malware and ransomware
Malware is software designed to damage a device, steal information or give somebody access to it.
Ransomware is a type of malware that locks files or systems and demands payment. Reliable backups and well-maintained devices can make a major difference to how well a business recovers.
Outdated technology
Software updates are easy to put off, especially when everyone is busy. However, those updates often fix known security weaknesses.
The longer a device or application goes without an update, the longer that weakness remains open. Technology that is no longer supported should also be replaced or carefully managed.
Everyday cyber security measures for businesses
You do not need to change everything at once. Start with the basics and make sure they are being used consistently across the business.
Give every account its own password
Passwords should be strong and unique. A password manager makes this much easier because your team does not have to create or remember dozens of different logins.
Use multi-factor authentication
Multi-factor authentication asks for another form of verification when somebody signs in. Even if a password is stolen, that extra check can help keep the account protected.
Email, Microsoft 365, banking and other important cloud services are sensible places to start.
Keep everything updated
Install security updates promptly and check that your devices are still supported. Updates can often be managed centrally, so you are not relying on every employee to remember.
Check who has access
People only need access to the systems and information required for their job. Administrator access should be limited, while accounts belonging to former employees should be removed promptly.
It is also worth reviewing access when somebody changes role. Permissions have a habit of building up over time.
Look after your email
Email is one of the most common ways attackers reach a business. Secure settings and filtering can help, but your team also needs to know what to do if a message does not feel right.
Make it easy for people to ask. Nobody should feel daft for double-checking an unexpected request.
Back up the information you rely on
Regular backups give you another way to recover files if they are deleted, damaged or locked by ransomware.
Those backups need protecting too. They should not be easy for an attacker to access, and they should be tested occasionally to make sure the information can actually be restored.
Be careful with unfamiliar websites
A padlock in the browser does not guarantee that a website is genuine. It only means the connection between your browser and that website is encrypted. Fraudulent websites can use encryption too.
Check the web address carefully, particularly before entering a password or payment information.
What is Cyber Essentials for small business?
Cyber Essentials is a government-backed scheme that helps organisations protect themselves against common online attacks.
It focuses on five areas:
- Firewalls
- Secure configuration
- Security updates
- User access
- Malware protection
There are two levels. Cyber Essentials uses a verified self-assessment. Cyber Essentials Plus covers the same protections but includes independent technical testing.
For a small business, certification can provide a useful structure for improving security. It also shows customers that you take the protection of their information seriously. Some organisations ask suppliers to hold Cyber Essentials before they can bid for work.
The National Cyber Security Centre describes it as the minimum standard of cyber security recommended by the Government for organisations of all sizes. Find out more about Cyber Essentials
Why getting Cyber Essentials certified is good for business
Making cyber security in business easier to manage
Most business owners already know they should have secure passwords, working backups and up-to-date devices. The harder part is knowing whether everything is set up properly and keeping on top of it as the business changes.
That is where Supportwise can help.
We support small businesses with the everyday work that keeps their IT secure, including monitoring, updates, Microsoft 365 security, antivirus protection, cloud backup, password management and Cyber Essentials certification.
We will look at what you already have, explain where the gaps are and help you deal with the most important things first. No scare tactics and no expectation that you should already know all the answers.