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In cybersecurity, the acronym 'RAT' refers to "Remote Access Trojan." This type of malware enables a malicious actor to gain unauthorized access and control over a victim's computer or network remotely. Once installed, a RAT allows the attacker to execute commands, steal sensitive information, monitor user activities, and sometimes even use the infected device to launch further attacks.

Understanding that RATs are specifically crafted for remote access highlights their primary function and the risk they pose to individuals and organizations. These tools are often delivered through seemingly benign software, making them a stealthy and effective means for cybercriminals to exploit vulnerabilities.

While the other options may contain terms that are relevant to cybersecurity, they do not accurately represent what RAT stands for in this context. For example, a "Remote Assistance Tool" refers to legitimate software designed to help users troubleshoot issues remotely. "Real-time Antivirus Tool" describes software that provides ongoing protection against viruses but is unrelated to RATs. Lastly, a "Ransomware Attack Tracker" is a hypothetical tool that might track ransomware activities, but it is not associated with the acronym RAT. Thus, the significance of "Remote Access Trojan" as the correct answer emphasizes its role as a tool used by attackers in cybersecurity threats.