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May 2017 me ek dangerous cyber attack hua jiska naam tha WannaCry. Ye ek ransomware tha jo mainly Microsoft Windows computers ko target karta tha. Iska kaam simple tha — system me ghusna, files ko lock kar dena, aur phir unhe unlock karne ke liye paise maangna. Jab WannaCry kisi computer me enter hota tha, toh wo saari important files encrypt kar deta tha. Uske baad screen par ek message aata tha jisme likha hota tha ki agar 3 din ke andar $300 Bitcoin me pay nahi kiya gaya, toh amount badh ja