Classroom
Google Classroom is a free web service, developed by Google for schools, that aims to simplify creating, distributing, and grading assignments in a paperless way. The primary purpose of Google Classroom is to streamline the process of sharing files between teachers and students.
Drive
Store and organize assignments, documents, or class curriculum securely and access them from any device. Google Drive encompasses Google Docs, Google Sheets, and Google Slides, which are a part of an office suite that permits collaborative editing of documents, spreadsheets, presentations, drawings, forms, and more