Ransomware is a term used for malware that infects a computer and makes changes to a computer or the files on it that may be undone after the computer's owner pays the attacker.
The most common form of change that ransomware currently makes is encryption of files on the computer it infects.
Unlike most malware, ransomware does not stay in stealth mode on a computer it infects. Rather, after ransomware has finished making changes to the computer or files, it announces its presence to the computer's owner. The announcement may