Unauthorized access refers to the act of gaining entry to a computer system, network, or data without permission. This can occur through various means, such as hacking, exploiting vulnerabilities, or using stolen credentials. Unauthorized access can lead to data breaches, theft of sensitive information, and other security incidents. Organizations implement security measures, like firewalls and encryption, to prevent unauthorized access. It is crucial for individuals and businesses to understand the risks associated with unauthorized access and to take steps to protect their data and systems. Regular security audits and employee training can help mitigate these risks.