This video tutorial demonstrates how to automatically label emails in Gmail using filters. The instructor guides viewers through creating a filter for emails related to a 'Back to School' conference, identified by the acronym BTS. The tutorial covers setting up the filter, applying labels, and testing the functionality to ensure emails are organized efficiently. The video concludes with a demonstration of the benefits of using labels and filters for better email management.

Explain how to apply the created label to matching conversations in Gmail.

What happens to emails that are moved back to the inbox after being labeled?