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 security vulnerability, not a cloud provider service. All major clouds offer security tools (WAF, CDN, scanning, logging) that can help reduce XSS risk, but none are “the XSS service.”