Malware, short for malicious software, refers to any type of software or code that is intentionally designed to harm, disrupt, or gain unauthorized access to a computer system or network. This can include viruses, worms, trojans, spyware, and other types of harmful programs. Malware can be spread through various means, such as infected email attachments, malicious websites, or even through physical devices like USB drives. Once installed on a device, malware can cause a range of issues, from slowing down the system to stealing sensitive information. It is important to have proper security measures in place to protect against malware and regularly scan devices for any potential threats.