Intrusions refer to unauthorized access or attempts to access a computer system, network, or other electronic device. This can include hacking, malware attacks, social engineering, or other methods used to gain access to sensitive information or disrupt operations. Intrusions can have serious implications, including data breaches, financial losses, and damage to reputation. Researchers in this area focus on understanding and preventing intrusions, developing security measures and protocols, and investigating methods used by attackers to gain unauthorized access. They may also study patterns and trends in intrusions to improve detection and response strategies.