Cross-Site Scripting - vulnerability where malicious scripts are injected into trusted websites. Like someone putting fake signs in a store to mislead customers.
Web developers sanitize user inputs to prevent XSS attacks that could steal user credentials or personal data.
XSS (Cross-Site Scripting) is a web application vulnerability, not a cloud provider service. All major clouds offer security services (e.g., WAFs, security scanning, managed gateways) that can help reduce XSS risk, but none are “XSS” itself.