Google Classroom is Google's new foray into the education market. Others like Edmodo have been there much longer and are more firmly entrenched. Right now, if you already use Edmodo, it is this author's opinion that switching to Classroom probably isn't worth it.
However, if you're looking to move beyond your static classroom webpage, Classroom is a fairly simple option. You can find it at classroom.google.com.
Above is a screenshot of the Classroom news feed. There, teachers can make announcements, post links, and post assignments. The advantage Classroom does have is its tight integration with Google Docs. If a teacher uses the "assignment" option in Classroom (for more information click here), Classroom automatically creates a folder in the teacher's Drive account. When the students turn in their assignments on Docs, the file automatically goes into the correct folder.
That automatic filing is a significant step up from using the "Shared with me" window in Drive and then manually sorting files into folders from there.
