Google Analytics 4 or GA4(formerly known as “App + Web”) is a new kind of property, with different reports than what you’re used to seeing in Universal Analytics properties. One advantage of a Google Analytics 4 property is that you can use it for a website, an app, or both a website and app together. Universal Analytics properties only support websites.
GA 4 comes with enhanced measurement capabilities, with its entire reporting revolving around an event framework. It gives you the capability to collect the data in the form of events for the interactions that you see and want to track and are the best fit for your website.
GA 4 helps tracking events seamlessly across Web and Mobile views at the same time. This helps aggregate data for your domain under one roof and makes reporting easier.