Definition
A worm is a type of self-replicating malware that spreads across computer networks without human intervention, unlike viruses that require a host file. It exploits vulnerabilities in operating systems or applications to propagate itself from one system to another, often consuming bandwidth and system resources. Understanding worms is crucial for designing secure networks and defending against widespread cyberattacks. For instance, the ILOVEYOU worm in 2000 caused billions of dollars in damage by spreading rapidly through email attachments. Unlike a virus, a worm does not need to attach itself to an existing program to spread. This concept is fundamental in cybersecurity domains covered by certifications like CompTIA Security+ and CySA+.