Google describes Google Classroom as "mission control for your classroom," and this might be the easiest way to think about it. Simply put, it's a platform that ties together Google's G Suite tools for teachers and students. It also acts as a digital organizer where teachers can keep class materials and share them with students -- all paperless-ly. From there, you can pick and choose the features you want to incorporate. This flexibility, and its seamless integration with Google's popular tools, is likely what's made Google Classroom one of the most widely-used edtech tools today.