How to Compare Engineer Mode and User Mode Terminals

Engineer mode terminal, sometimes we call them development terminal, develop mode terminal, that's the same terminal, here are the features:

1. Used by the application developer.
2. Has ADB for easy developing process.
3. Do not verify the signature of the app.
4. There are "engineering mode" watermark in the bottom corner of the screen.

User mode terminal, sometimes we call them production terminal, end-user terminal, here are the features:

1. Used by the end-user.
2. Without ADB port in production terminal.
3. Forced to verify the app's signature.