Google Analytics 4 is an analytics service that enables you to measure traffic and engagement across your websites and apps. This documentation provides implementation instructions and reference materials geared towards a developer audience.
Google Analytics 4 is a new kind of property with different reports than what you're used to seeing in Universal Analytics properties. If your website currently uses a Universal Analytics property and you want to use a Google Analytics 4 property, see Make the switch to Google Analytics 4. You can also visit the Developer Migration Center for migration information geared towards a developer audience.