Ransom:Win32/Blocker!Pz is a type of ransomware that infects computers by encrypting files and demanding payment for the decryption key. It typically spreads through malicious email attachments, infected websites, or by exploiting vulnerabilities in outdated software. Once a computer is infected, the ransomware will display a message demanding payment in exchange for the decryption key to unlock the encrypted files. It is important to regularly update software, use strong antivirus protection, and avoid clicking on suspicious links or email attachments to prevent infection by Ransom:Win32/Blocker!Pz.