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XSS, cross-site scripting attack, is a dangerous security threat in the online world.

It refers to the attacker injecting malicious script code into the web page by exploiting the vulnerability of the website or application in processing user input. When the user visits the page injected with malicious code, the browser will execute the malicious script.

These malicious scripts may steal users' personal information, such as login credentials, account passwords, etc. They can also tamper with web page content, mislead users into making incorrect operations, or perform other malicious actions on users' devices.

There are various ways of XSS attacks. For example, reflected XSS is triggered by inducing users to click on specific links containing malicious code; stored XSS stores malicious code on the website server for a long time, so that users who visit related pages may be attacked.

To prevent XSS attacks, website developers need to strictly review user input and properly process and escape data. Users themselves should also be vigilant and not click on unknown links at will to protect the security of personal information.