Definition
Cybersecurity is the discipline of protecting computer systems, networks, software and data from theft, damage, disruption and unauthorised access. It covers technology, such as firewalls, encryption and multi-factor authentication, but equally processes and people: who has access to what, how software is kept up to date, how staff recognise a phishing email and what the company does in the first hour after a breach. For most companies the biggest risk is not a genius hacker but a reused password.
In a company, cybersecurity shows up as the controls around your most valuable assets: customer data, money, intellectual property and the ability to keep operating. The common attacks are phishing, where an employee is tricked into giving away credentials; ransomware, where systems are encrypted and held for payment; business email compromise, where a fake invoice gets paid; and stolen credentials used to log in as a legitimate user. Enterprise customers and insurers now ask for evidence of controls before signing.
The misconception is that small companies are not targets. Attackers automate, and a small company with weak defences and a bank account is an easy win. In 2026 AI has raised the stakes on both sides: phishing messages are fluent and personalised at scale, deepfake voices impersonate executives on calls, and defenders use AI to detect anomalies faster. The fundamentals still stop most attacks: multi-factor authentication everywhere, prompt patching, least-privilege access, tested backups and a workforce that pauses before clicking.
In practice
A mid-sized company nearly paid a six-figure fake supplier invoice after an attacker gained access to a manager's email and changed the bank details on a real invoice. A simple rule, phone confirmation for any change of bank account, was introduced the following week.
Why it matters
Cybersecurity is a board-level risk, not an IT setting. One incident can cost you customers, a regulatory fine and weeks of operations. The good news is that a short list of basics, consistently applied, prevents the large majority of attacks.
Frequently asked questions
- What are the most common cyber attacks on small businesses?
- Phishing emails that steal credentials, ransomware that encrypts systems until a payment is made, business email compromise where fake invoices or changed bank details lead to fraudulent payments, and attacks using passwords leaked from other services. Almost all of them rely on human error or missing multi-factor authentication.
- What is the minimum cybersecurity a company should have?
- Multi-factor authentication on every account, a password manager, automatic software updates, regular tested backups kept separate from the main systems, role-based access so people only see what they need, staff training on phishing, and a written plan for what to do in the first hours of an incident. This baseline stops most attacks.