Explanation:
Malware, short for malicious software, is any program or file intentionally created to cause harm, gain unauthorized access, or disrupt normal system operations.

Common types of malware include viruses, worms, Trojans, ransomware, and spyware. Malware can infect computers through malicious websites, phishing emails, and software vulnerabilities.

The impact of malware ranges from data theft and unauthorized access to complete system shutdowns and financial losses.

Additional Information:
Advanced malware variants employ stealth techniques like code obfuscation and polymorphism to evade detection. Organizations use antivirus software, endpoint protection platforms (EPP), and security awareness training to combat malware threats.

The rise of sophisticated malware-as-a-service (MaaS) operations on the dark web presents new challenges to cybersecurity experts.

Formal Definition:
Malware is malicious software designed to disrupt, damage, or gain unauthorized access to computer systems or data, often with the intention of causing harm or theft.