What is the .idea folder?

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When you use the IntelliJ IDE, all the project-specific settings for the project are stored under the .idea folder.

Project settings are stored with each specific project as a set of xml
files under the .idea folder. If you specify the default project
settings, these settings will be automatically used for each newly
created project.

Check this documentation for the IDE settings and here is their recommendation on Source Control and an example .gitignore file.

Note: If you are using git or some version control system, you might want to set this folder “ignore”.
Example – for git, add this directory to .gitignore. This way, the application is not IDE-specific.

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