These are blocks Blocks are used to make the app work its the way the app runs its like a code blocks is how you program your app to work one the inside .
Block. App Inventor is a blocks programming language. Blocks are the pieces you connect together to tell your app what to do.
The App Inventor servers store your work and help you keep track of your projects. You build apps by working with: The App Inventor Designer, where you select the components for your app. The App Inventor Blocks Editor, where you assemble program blocks that specify how the components should behave.Â