In recent android launches(4.2 and +) Google hided developer’s options in settings.
Goto Settings scroll down and if you are unable to see developer’s options then here is a way:
Now through setting->About phone..
Find Build number and tap on it until you become devoloper(as you go on pressing toast will appear saying “You are x step away )
tap until mobile congratulates “You are now developer”
You are done!
Most Common feature used in it is Usb debugging
Check it and now usb debugging is on.
Explore through Developers option and experience a new android features.