Which type of malware is to demand payment in exchange for restoring access to data? Explain briefly?

Ransomware is the type of malware that is used to demand payment in exchange for restoring access to data. Ransomware encrypts the victim's files and demands payment, usually in the form of cryptocurrency, in order to provide the decryption key to unlock the files. This type of malware is often spread through phishing emails or malicious websites, and can have devastating consequences for individuals and organizations who fall victim to it.