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Home/Glossary/Spyware
Glossary · Technical Concept

What Is Spyware?

Software that secretly monitors and collects information about a user's online activities, personal data, and device usage, then transmits this data to third parties without the user's knowledge or consent.

Quick Definition

Software that secretly monitors and collects information about a user's online activities, personal data, and device usage, then transmits this data to third parties without the user's knowledge or consent.

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01Spyware explained.

Spyware is designed to spy on you. It can monitor your browsing history, capture login credentials, read your emails, access your camera and microphone, track your location, and even record phone calls — all without any visible indication that it's running.

Commercial spyware (sometimes called "stalkerware") is a growing concern, often used by abusive partners, controlling parents, or employers for unauthorized surveillance. Products like Pegasus have been used by governments to surveil journalists, activists, and political opponents.

Spyware often arrives bundled with free software, through malicious ads, or via phishing attacks. Some variants can be installed with physical access to the device in just minutes, making it a tool for both remote and in-person attacks.

02How it works.

01Spyware is installed through malicious downloads, phishing, exploited vulnerabilities, or physical access
02It runs invisibly, monitoring online activity, keystrokes, camera, microphone, and location
03Collected data is transmitted to the attacker or a command-and-control server
04The user remains unaware, as spyware is designed to avoid detection
05The attacker uses the intelligence for surveillance, blackmail, identity theft, or further attacks

03Real-world example.

The Pegasus spyware, created by Israeli firm NSO Group, can infect iPhones through zero-click exploits — no user interaction required. It was found on the phones of journalists, human rights activists, and government officials in over 50 countries, capable of reading messages, tracking location, and activating cameras.

04How to protect yourself.

01Keep your devices and apps updated to patch vulnerabilities exploited by spyware
02Only install apps from official app stores and review permissions carefully
03Use mobile security software that detects stalkerware and spyware
04Be cautious of free software that requires excessive permissions
05If you suspect spyware, factory reset your device and change all passwords from a clean device
Related Terms
MalwareKeyloggerTrojanIdentity Theft
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