This is a program that inserts copies of itself into other computer programs, data files, or sectors of the hard drive.

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Quizplus · Accepted Answer

This describes a computer virus, which replicates and inserts itself into other files or programs, potentially causing harm or disruption to the system. Worms also self-replicate, but typically do not attach themselves to other files or programs. Trojans are disguised as harmless programs or files, but contain malicious code. Denial-of-service attacks do not involve inserting copies of a program, but instead flood a server or network with traffic to prevent legitimate users from accessing it.

This Is a Program That Inserts Copies of Itself into Other