Malware
Malware is a short term for malicious software. Malware is basically a piece of software that does malicious activity. Malicious activity can be of many types such as stealing user's personal information (such as usernames, passwords, credit card information etc.) providing backdoor access to attacker, destroying files on the system, etc. anything that is designed to damage, disable or disrupt computer or computer systems.
Wikipedia
Malware, short for malicious (or malevolent) software, is software used or created by attackers to disrupt computer operation, gather sensitive information, or gain access to private computer systems. It can appear in the form of code, scripts, active content, and other software.'Malware' is a general term used to refer to a variety of forms of hostile or intrusive software.