Remote Code Execution (RCE) is a type of security vulnerability that allows an attacker to run arbitrary code on a remote system. This can happen when software does not properly validate user input, enabling malicious users to exploit the system and execute harmful commands. RCE can lead to unauthorized access, data theft, or complete control over the affected system. To prevent RCE, developers should implement secure coding practices, such as input validation and regular software updates. Tools like firewalls and intrusion detection systems can also help protect against such attacks by monitoring and blocking suspicious activities on networks.