The developer tab is the toolbar that has the button to all related VBA Editors, Record Macro, Create Form and ActiveX control buttons, Check box, Textbox, Scroll bar etc.....
How to Enable Developer Tab on Ribbon in Excel 2013/2016
Step 1 is Click File Button Top left On the screen.
and click second last Button click OPTION Button. When you insert Excel option Popup window click Customize Ribbon and check Developer
last and final step to click Ok Button and you developer Tab is On Ribbon or Toolbar