A software entity that appears to do something normal but which, in fact, contains a trapdoor or attack program.

the software which protects the computer from getting virus which totally affects the total working of the computer

its a program which seems to do something normal but it is actually attached to the files and executed itself infinitely when the attached file executed once..

Trojan Horse is a virus means a malicius program that is attached to our files and run automatically infinitely and corrupts all files.

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