Network intrusion refers to unauthorized access to a computer network, where an attacker exploits vulnerabilities to gain control or steal information. This can involve various methods, such as malware, phishing, or exploiting software weaknesses. The goal is often to disrupt services, steal sensitive data, or compromise network integrity. To protect against network intrusion, organizations implement security measures like firewalls, intrusion detection systems, and regular software updates. These tools help monitor network traffic and identify suspicious activities, ensuring that potential threats are detected and mitigated before they can cause significant harm.