The type of cybersecurity threat that involves unauthorized access to a network with malicious intent is known as a breach. Breaches can occur through various methods, including exploiting vulnerabilities, phishing attacks, or using stolen credentials. Once inside the network, attackers can steal sensitive information, disrupt services, or install malware. Prevention strategies, including firewalls, intrusion detection systems, and employee training, are essential to mitigate the risk of breaches and protect organizational data.