Ransomware is a specific type of malware that encrypts users’ files, preventing or limiting them from accessing their system. The earliest ransomware versions and the current ones have very little in common.
Those ones also locked the users’ files unless a ransom was paid; however, the payment had to be made via snail mail.
These days, the masterminds behind ransomware require the payments to be sent via credit cards or cryptocurrency.
The latest types of ransomware include screen lockers, encrypting ransomware, and scareware.