Android developer mode is a hidden menu housing additional rights to manipulate your Android device. The option is not visible by default, to keep normal day to day users from Mal-administering wrong usage dose to their phone.

HOW TO ACTIVATE DEVELOPER OPTION

Open "settings".

Scroll down to "about phone" option

Tap continuously on "build number" until the final popup message reveals "you are now a developer" (might require ten taps if possible).


Check back your settings menu to see the developer options as one of the last menus.
Now, what can I do with the exposed ruby...

There are simplistic features like stay awake, running services, aggressive wifi to mobile hand over, animation scale control and limit or totally destroy app activities to more complex tweak settings like take bug report, OEM unlocking, USB debugging, pointer and some GPU related handling with lots of other unmentioned options.

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