This guide provides a comprehensive step-by-step process for blocking a domain or subdomain from Google Analytics 4 (GA4) by setting up a filter. It walks you through accessing your GA4 property, creating a data stream filter, setting up the filter conditions to exclude specific domains or subdomains, and testing to ensure the filter works correctly. By following this guide, you can prevent unwanted traffic from certain domains or subdomains from being recorded in your GA4 reports, ensuring more accurate data analysis.