title: What is use of toolbar and action bar?
body: <p>I am new to android i didn't understand what is the use of toolbar. In place of toolbar we can use any layout like relativelayout then we can design it. 
  And in  toolbar if you want add any button we are creating menu folder and we are doing so many nonsense thing
  So inplace of taking toolbar better to take layout. 
  Please anyone give me the answer why we are using toolbar and actionbar</p>