A computer worm is a type of malicious software that replicates itself to spread to other computers. Unlike viruses, worms do not need to attach themselves to a host file; they can independently exploit vulnerabilities in software or networks. Once a worm infects a system, it can consume bandwidth, slow down performance, and even create backdoors for other malware. Worms often spread through email attachments, downloads, or network connections. They can cause significant damage by deleting files, stealing data, or allowing unauthorized access. Keeping software updated and using antivirus programs can help protect against these threats.