All of the apps available on the Rocket.Chat marketplace are classified as marketplace apps, also known as public apps. If you are a third-party publisher or developer, you can submit your app to the marketplace.
Private apps are those that are not available on the marketplace and are created by your in-house development team. You can develop private apps for specific business needs in your workspace. In addition, you can choose to publish the app to the marketplace for others to install and enable it in their workspaces.