“Classroom is extremely helpful for teachers because it allows them to easily create and distribute assignments in a matter of minutes. It enables them to provide rich, nuanced feedback to students ...

Google Classroom works best on a laptop or machine with a full-size keyboard—especially for kids who have writing assignments. But it also does surprisingly well on phones and tablets.

Google’s launch of Classroom last year was a natural next step for that. Now, with more than 50 apps integrating with Classroom, Google is making the service more extensible.