The terms 'WannaCry, Petya and EternalBlue' are all related to cyber attacks.

• 'WannaCry' is a ransomware that locks users' devices and prevents them from accessing data and software until a certain ransom is paid to its creator.

• 'Petya' is another type of ransomware that spreads rapidly through networks that use Microsoft Windows.

• The Petya and WannaCry cyber-attacks in May and June 2017 are two of the biggest in history and impacted the finances of companies throughout the globe.

• 'EternalBlue' is a cyber exploit developed by the U.S. National Security Agency (NSA). It was used in the 2017 WannaCry ransomware attack and exploits a vulnerability in the Microsoft implementation of the Server Message Block (SMB) Protocol.