How is malware defined?

Malware is defined specifically as malicious software that is created with the intent to harm or exploit any programmable device, service, or network. It encompasses various types of harmful programs, including viruses, worms, trojans, ransomware, spyware, and adware, all of which can disrupt computer operations, gather sensitive information, or gain unauthorized access to systems.

The emphasis on 'malicious' in the definition is crucial, as it highlights the harmful intent behind malware, which distinguishes it from legitimate software meant for beneficial functions. Other choices refer to software that serves constructive purposes, such as system maintenance, networking, or performance optimization, which do not align with the nature of malware. Therefore, the accurate characterization of malware focuses on its role as a tool for compromise and harm to systems, aligning directly with the correct answer.