You can use applications, libraries, and integration projects to organize your resources.
You can use applications, libraries, and integration projects to build your solution. An application is a container for everything that you need for your solution. A library contains a set of resources that you might want to reuse for other solutions. You can add one or more libraries to an application, then you can deploy your solution by dragging the application onto an integration server.
Message flow projects have been replaced by integration projects for WebSphere Message Broker Version 8.0 onwards. When you import resources from WebSphere Message Broker Version 7.0 and previous versions, message flow projects are converted automatically to integration projects. You might want to convert your integration projects to applications or libraries, depending on the way in which you intend to use these resources. For an example of how you might convert migrated projects, see Example: Manual conversion of Version 7.0 resources to applications and libraries.