What is the difference between a worm and a virus?

The distinction between a worm and a virus primarily lies in how they propagate and infect systems. A worm is a standalone malware that can replicate itself and spread independently across networks without needing to attach itself to a host file or require any user interaction. This self-replicating nature allows worms to proliferate rapidly through networks, often exploiting vulnerabilities in software or operating systems.

In contrast, a virus must attach itself to a host file or program to spread. It relies on user actions, such as opening an infected file or running an infected program, to be activated and potentially infect other systems. The reliance on a host file is a key characteristic that sets viruses apart from worms.

Understanding this fundamental difference is crucial for cybersecurity analysts as it influences how these types of malware are detected, contained, and remediated within networks and systems. Identifying the propagation methods of each type aids in developing effective defense strategies and response plans.