Final answer:
To create an app in NetBeans, you must first create a project which is a collection of related files such as code and images that make up the app.
Step-by-step explanation:
To create an app in NetBeans, you must first create a project. A project in NetBeans is a collection of related files, such as code, libraries, and images that make up an app. These files can be source code files (.java for Java applications), resource files (such as images), configuration files, and many more types that work together to form the complete application.