Unlike most email servers that rely on a set of folders to organize messages, Gmail ditches folders in favor of labels. These labels are a tagging system for emails. Learn how to use labels to organize messages with Gmail on any operating system.
How to Organize Your Emails Using Gmail Labels
Sorting by folders stores emails in one location. Sorting by labels can apply multiple labels to a single message.
To add one or more labels to Gmail messages:
Sign in to your Gmail account