Defacing refers to the act of modifying or altering a website without permission from its owner. This can include adding, removing, or changing content, as well as manipulating the site's layout and design. Defacing can be done for various reasons, including to express political opinions, to protest against certain policies or practices, or simply to demonstrate one's technical skills.
There are several types of defacing, including but not limited to: adding or removing content, changing the site's layout or design, inserting pop-ups or ads, and modifying the website's functionality. Some defacers may also use this opportunity to spread malware or viruses.
Defacing can have significant consequences for the website and its owner. In some cases, it may be seen as a form of vandalism or cybercrime, leading to legal action being taken against the perpetrator. Additionally, defacing can also cause damage to the website's reputation and credibility.