An "Error Code" is a specific alphanumeric sequence that a computer or software program generates to indicate a problem or malfunction. These codes help users and technicians identify the nature of the issue, making troubleshooting more efficient. Each code corresponds to a particular error, allowing for quicker diagnosis and resolution. Error codes can appear in various contexts, such as operating systems, applications, and hardware devices. For example, a Windows operating system might display an error code like "0x80070005," which signifies an access denied issue. Understanding these codes is essential for effective problem-solving and maintaining system functionality.