With the advent of GA4 property, the Google Analytics account structure has changed a bit. Now we have got data stream(s) under the new GA4 property.
A data stream is a flow of data from a customer touchpoint (e.g., app, website) to Analytics.
In the context of the Google ecosystem, an organization represents a company that owns one or more Google products (like Google Analytics, Google Tag Manager, Google Optimize, Google Data Studio, etc).
You access your organizations at https://marketingplatform.google.com/home
You can link one or more GA accounts to your organization.
Each GA account is made up of one or more properties (called the GA property). Earlier a GA property used to represent either website or mobile app. Now a GA property can also represent both websites and mobile apps.
The general account structure for an GA4 property is very similar to what we’re familar with with classic GA properties. There is, however, one main difference instead of views under a property, there are data streams under a GA4 property.
Data streams are the data sources for GA4 properties.You can have app data streams, so that you can capture data from app asset and similarly web streams to capture data from your website.