Hacking refers to the act of gaining unauthorized access to computers, networks, or digital devices, typically by exploiting vulnerabilities or bypassing security measures. While hacking is often associated with malicious intent - such as stealing data, disrupting services, or causing harm - it can also be performed by security professionals (ethical hackers) who test systems to identify and fix weaknesses. Hacking techniques range from technical exploits and social engineering to brute-force attacks. Understanding hacking is essential for improving cybersecurity and protecting sensitive information.