The video tutorial explains how to use JSON files in Python applications. It covers creating JSON files, loading them into an application, and using the built-in JSON module to read and write data. The tutorial demonstrates how to save changes to JSON files, ensuring data persistence across application runs. By the end, viewers will understand how to use JSON as a local database in Python programs.

Explain how to save changes made to a JSON file in Python.

What happens to the data in a JSON file when the application is closed?