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Cybersecurity Quick Definitions

Welcome to the Cybersecurity Quick Definitions (A–Z)

Whether you’re just starting your cybersecurity journey or brushing up on key concepts, this A–Z guide explains important terms in clear, plain English.

Each quick definition includes:

  • A simple definition
  • Why it matters
  • A real-world example

Browse the glossary alphabetically and build your cybersecurity knowledge one term at a time.

A

Cybersecurity Quick Definitions card explaining Access Control List (ACL).
Cybersecurity Quick Definitions card explaining Ad Blocker.
Cybersecurity Quick Definitions card explaining Authentication.
Cybersecurity Quick Definitions card explaining Authorisation.

B

Cybersecurity Quick Definitions card explaining Biometrics.
Cybersecurity Quick Definitions card explaining Bring Your Own Device (BYOD).
Cybersecurity Quick Definitions card explaining Brute Force Attack.

C

Cybersecurity Quick Definitions card explaining Certificate Warnings.
Cybersecurity Quick Definitions card explaining Cross Site Scripting (XSS).
Cybersecurity Quick Definitions card explaining Cryptominer.

D

Cybersecurity Quick Definitions card explaining Decryption.
Cybersecurity Quick Definitions card explaining Denial Of Service (DOS).
Cybersecurity Quick Definitions card explaining Dictionary Attack.
Cybersecurity Quick Definitions card explaining Digital Certificate.
Cybersecurity Quick Definitions card explaining Dumpster Diving.

E

Cybersecurity Quick Definitions card explaining Encryption.
Cybersecurity Quick Definitions card explaining Evil Twin.

F

Cybersecurity Quick Definitions card explaining False Alerts.
Cybersecurity Quick Definitions card explaining Firewall.
Cybersecurity Quick Definitions card explaining First Responder.

G

Cybersecurity Quick Definitions card explaining General Data Protection Regulation (GDPR).

H

Cybersecurity Quick Definitions card explaining Hard Token.
Cybersecurity Quick Definitions card explaining Hashing.

I

Cybersecurity Quick Definitions card explaining Impersonation.
Cybersecurity Quick Definitions card explaining In Private Browsing.
Cybersecurity Quick Definitions card explaining Intrusion Detection System (IDS).
Cybersecurity Quick Definitions card explaining Intrusion Prevention System (IPS).

K

Cybersecurity Quick Definitions card explaining Keylogger.

M

Cybersecurity Quick Definitions card explaining MAC Spoofing.
Cybersecurity Quick Definitions card explaining Malware.
Cybersecurity Quick Definitions card explaining Mobile Device Management (IMDM).
Cybersecurity Quick Definitions card explaining Multi-Factor Authentication (MFA).

N

Cybersecurity Quick Definitions card explaining Network Appliances.

O

Cybersecurity Quick Definitions card explaining On-Path Attack.

P

Cybersecurity Quick Definitions card explaining Password Manager.
Cybersecurity Quick Definitions card explaining Phishing.
Cybersecurity Quick Definitions card explaining Pop-Up Blocker.
Cybersecurity Quick Definitions card explaining Principle of Least Privilege.
Cybersecurity Quick Definitions card explaining Proxy Server.

R

Cybersecurity Quick Definitions card explaining Ransomware.
Cybersecurity Quick Definitions card explaining Redirection.
Cybersecurity Quick Definitions card explaining Rootkit.

S

Cybersecurity Quick Definitions card explaining Shoulder Surfing.
Cybersecurity Quick Definitions card explaining Social Engineering.
Cybersecurity Quick Definitions card explaining Soft Token.
Cybersecurity Quick Definitions card explaining Spear Phishing.
Cybersecurity Quick Definitions card explaining Spyware.
Cybersecurity Quick Definitions card explaining SQL Injection.

T

Cybersecurity Quick Definitions card explaining Tailgating.
Cybersecurity Quick Definitions card explaining Trojan Horse.
Cybersecurity Quick Definitions card explaining Trusted Sources.

U

Cybersecurity Quick Definitions card explaining Unwanted Notifications.

V

Cybersecurity Quick Definitions card explaining Virus.
Cybersecurity Quick Definitions card explaining Vishing.

W

Cybersecurity Quick Definitions card explaining Whaling.

Z

Cybersecurity Quick Definitions card explaining Zero-Day Attack.

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Ready to learn more?
These quick definitions are a great starting point. Explore the Cybersecurity Essentials page for interactive activities, practical examples, and beginner-friendly learning resources.

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