Spyware

Security+ 🏆 • Threats ⚠️ • Difficulty: free

Definition

Spyware is malware that secretly monitors a device or user activity and collects information such as credentials, messages, browsing behavior, or sensitive files. It is designed to stay hidden while sending collected data to an attacker or another unauthorized party.

Examples

  • A fake browser extension records browsing activity and sends it to an external server without the user’s knowledge.
  • A keylogger captures login details entered on a compromised laptop and forwards them to an attacker.

Discover 🔎

Spyware is built for observation. Instead of immediately causing obvious damage, it tries to blend into normal activity and quietly collect information over time. That makes it dangerous, because victims may not notice anything wrong until accounts are taken over, data is leaked, or sensitive information is used for fraud.

Spyware also matters because it can appear in different forms. Some spyware is clearly criminal and designed for theft. Other spyware is packaged as “monitoring” software and ends up being used in abusive or unauthorized ways.

Remember: Spyware is about surveillance and data collection. Its goal is to learn, steal, and report, while staying unnoticed.
Open the interactive lesson Browse more topics

Tip: The interactive version includes progress tracking, decks, and premium deep dives.