What is trojainising?

Hello People,
What is trojainising?
It is named for the virus Trojan horse. In this crime, the security measures of networks are compromised and the security tracking mechanisms/legitimate programs are modified for gaining unmonitored access in future. In such cases, the perpetrator's objective is to gain full control over the victim's network system so that unauthorized functions that are unknown to the owner can be executed. Have you any idea about it?

Hey,

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i hope it will not harm any of us in the future.