1. Encrypting Ransomware: This type of ransomware encrypts the victim's files and demands a ransom to provide the decryption key. Examples include WannaCry and CryptoLocker.
2. Locker Ransomware: Locker ransomware locks the victim out of their entire system, denying access to files and applications. It typically displays a full-screen message demanding a ransom. An example of locker ransomware is Winlocker.
3. Scareware: Scareware doesn't actually encrypt or lock files but uses scare tactics to trick victims into paying a ransom. It displays fake warnings or alerts, often claiming that the system is infected with malware. An example of scareware is FakeAV.

It is worth noting that these are just three common types of ransomware, and new variants are constantly emerging. Staying vigilant, regularly backing up files, and maintaining up-to-date security software are essential in protecting against ransomware attacks.

References:

• https://www.cisa.gov/ransomware
• https://www.kaspersky.com/resource-center/threats/ransomware