Labels help you organize your messages into categories. The advantage of labels over "folders" is that more than one label can be assigned to a message. Labels can also be created with sub-labels, in order to create a hierarchy.

Labels are only visible to you. The sender will never know what you've labeled their message (unless you tell them).

Labels can automatically be added to a conversation via filters. (See: )

Gmail supports a maximum of 5,000 labels.

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