Hacking in cyber security is the act of exploiting weaknesses in computers, networks, or applications to gain unauthorized access, control, or information, often for malicious purposes like stealing data or disrupting services.

What is hacking in cyber security?

In cyber security, hacking means compromising digital devices or networks by bypassing security controls to access data or systems that the attacker is not allowed to use. It usually involves finding vulnerabilities (bugs, misconfigurations, weak passwords) and using tools or techniques to turn those weaknesses into a working attack. While many people associate hacking only with crime, the same skills can be used legally by ethical hackers to test and improve security.

Key elements of hacking

  • Exploiting vulnerabilities in systems, networks, or apps.
  • Gaining unauthorized access or higher privileges than allowed.
  • Manipulating, stealing, or destroying data, or disrupting services.
  • Using technical skills, creativity, and persistence to bypass protections.

Simple example

Imagine a company has an internal web portal protected only by weak, guessable passwords. An attacker runs an automated password‑guessing tool (a brute‑force attack), logs in as an employee, then downloads sensitive customer records and installs malware for ongoing access. That full chain—from finding weak passwords to stealing data—is a basic real‑world pattern of hacking in cyber security.

TL;DR: Hacking in cyber security is the process of using technical methods to break into or manipulate computer systems and networks without proper permission, mainly by exploiting security weaknesses.