An unwanted program running on a computer is called a...?

An unwanted program running on a computer is referred to as a "malware." Malware is a broad category that includes various types of malicious software, such as viruses, worms, trojan horses, ransomware, and spyware. These programs are designed to harm, exploit, or otherwise compromise the functionality of a computer system without the user's consent.

Malware can disrupt the normal operation of computer systems, steal sensitive information, and allow unauthorized access to the user's data. It often spreads through email attachments, downloads from untrusted websites, or embedded links. Users are advised to utilize robust antivirus software, keep their operating systems and applications updated, and exercise caution while browsing to mitigate the risks associated with malware.