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Usually, a website gets infected thought content management systems (CMS) and plugins for them. There may be two different scenarios for this case. You may download an infected file from an unofficial source or an official plugin or update may contain errors that can be used by hackers. Such errors are called vulnerabilities.
A computer virus is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code. If this replication succeeds, the affected areas are then said to be "infected" with a computer virus.
Computer viruses generally require a host program. The virus writes its own code into the host program. When the program runs, the written virus program is executed first, causing infection and damage. A computer worm does not need a host program, as it is an independent program or code chunk. Therefore, it is not restricted by the host program, but can run independently and actively carry out attacks.