What does these Android process do?-Collection of common programming errors

when I debug my Android programs, in the error log there are numerous other processes throwing in errors, sometimes their names are self-explanatory (WindowManager, Babel, Android Runtime, ApiaryClient, Binder, etc.), but sometimes it’s not so clear. Here are a few names I hope you can help me clarify:

ElegantRequestDirector
ViewRootImpl
BluetoothMap
JavaBinder
ActivityThread  (is it the process that schedules all activity, including my activities?)