Malware/ˈmælwer/ Definition 1 of 1Pro Tip 1/3Harmful Intent Malware is intentionally designed to cause damage, unlike software bugs that are unintentional. The malware locked my files and demanded a ransom. Pro Tip 2/3Unauthorized Access Malware often tries to steal or manipulate your data without your consent. Malware can log your keystrokes to capture your passwords. Pro Tip 3/3Stealthy Nature Malware is usually hidden and might not be noticed until it's too late. She didn't realize malware was on her computer until it crashed.