When describing malware, what is a difference between a virus and a worm?

When describing malware, what is a difference between a virus and a worm?

• A virus replicates itself by attaching to another file, whereas a worm can replicate itself independently.
• A virus can be used to launch a DoS attack (but not a DDoS), but a worm can be used to launch both DoS and DDoS attacks.
• A virus focuses on gaining privileged access to a device, whereas a worm does not.
• A virus can be used to deliver advertisements without user consent, whereas a worm cannot.
  

  Answers Explanation & Hints: Malware can be classified as follows: Virus (self-replicates by attaching to another program or file) Worm (replicates independently of another program) Trojan horse (masquerades as a legitimate file or program) Rootkit (gains privileged access to a machine while concealing itself) Spyware (collects information from a target system) Adware (delivers advertisements with or without consent) Bot (waits for commands from the hacker) Ransomware (holds a computer system or data captive until payment isreceived)