A Remote Access Trojan (RAT) is a type of malicious software that allows cybercriminals to secretly take control of a victim’s computer over the internet. Once installed, a RAT can give attackers full access to files, webcams, microphones, and sensitive data, often without the user’s knowledge. This enables the attacker to steal information, install additional malware, spy on activities, or use the compromised device for further attacks. RATs are commonly spread through phishing emails, malicious downloads, or infected attachments, making them a serious threat to both individuals and organizations.