Blockly is the name of the visual programming editor that App Inventor uses to make the blocks in the browser.

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An app is said to have behavior. An app's behavior is how the app responds to user initiated and external events.

App Inventor is a blocks programming language. Blocks are the pieces you connect together to tell your app what to do. They can be found in the Blocks Editor.

Comments allow you to write reminders or quick remarks on blocks of code. You can use them to explain what certain blocks do or what you want to do later on. As comments are not run, they are for the [..]

Components are the pieces of your app that do actions for you. On the design screen, components are dragged from the Components Palette and placed on the phone. Examples of components are Label, Sound [..]

The screen where you can drag and drop component pieces and design them using the User Interface.

The second box in the hierarchy of blocks that goes Palette to Drawer to Block. An example of a drawer is Control.

Some blocks have a small dropdown arrow to the right of the name of the block. You can click on this arrow to change the name and function of the block. The get block is an example of a dropdown. For [..]

The name of the fake phone that appears on your computer if you don't have an Android device to work with is an emulator.