Classroom is an app for teachers, available for supported iPad devices and Mac computers, to hold classes in a schoolroom, remotely, or through a combination of nearby and remote locations (called hybrid classes).
When teaching in class, you can launch a specific app, website, or textbook page. You can also send documents to and receive them from your students, and share student work locally on a TV, monitor, or projector using Apple TV. Finally, you can see which apps students are working in and, at the end of the class, view a summary of how students spent their time.
Here is the Classroom main window for Mac, showing classes, groups, and the actions you can perform on students’ devices:
Using Classroom
There are three types of environments you can create for your classes:
Nearby: All students are in the same room with you, connected to the school’s Wi-Fi network.
Remote: All students (and you) are remote, connected to their Wi-Fi network or using a cellular connection from their iPad (requires that the iPad have cellular capability).
Hybrid: Some students are in the same room with you, connected to the school’s Wi-Fi network, and some students are remote.
Note: Only one active class type is supported on a device at a time.
from: https://support.apple.com/guide/classroom/what-is-classroom-cla6d39b9338/web