The modification to a Web page which has been the subject of unauthorized alteration. There are a number of motives for this electronic version of daubing walls and buildings with paint. It is carried out by a variety of users including hackers who enjoy the challenge of cracking a secure site, disgruntled ex-employees of the company whose site has been altered, and members of protest groups. A recent software utility Third Voice has, controversially, provided a means of carrying out this process with ease. It consists of a tool which can be used to deface a Web page and a plug-in for a browser. Any browser which uses this plug-in sees the additions made to the site by the users of the tool.