Website defacement is a form of cyber-attack where hackers drastically alter the visual appearance of a website or Web page. It can be compared to vandals messing up public walls or buildings with unwanted graffiti.

Web defacement is mostly done for ideological reasons. Hacktivists deface the websites of companies or organizations they accuse of social or political wrongdoing. They block access to the pages and replace their original content with a statement that strongly proclaims their beliefs and demands.

The attack is also used to make money such as when hackers deface a website during the course of a ransomware attack.

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