A _______ is a contagious program or code that attaches itself to another piece of software, and then reproduces itself when that software is run.

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**Solution:**

1. A computer virus is a type of malicious code or program designed to alter the way a computer operates.

2. It attaches itself to a legitimate program or file and reproduces itself when that software is run.

3. This behavior matches the description given in the question.

4. Other options like Trojan, adware, and spyware have different characteristics:
   - Trojan: Disguises as legitimate software but does not self-replicate.
   - Adware: Displays unwanted advertisements.
   - Spyware: Collects user information without consent.

**Answer:** virus

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