The Developer tab does not display on the Ribbon in Office apps by default, but it's easy to add and gives you access to advanced features like macros, ActiveX controls, and Word controls to Word, Excel, PowerPoint, and Visio. Here's how to set it up.
Why Bother with the Developer Tab?
When would you need the Developer tab?
Once you add the Developer tab to the Ribbon, you can stay visible unless you clear the check box or reinstall a Microsoft Office program.  How to Add the Developer Tab to the Ribbon
In this example, we'll demonstrate how to add the Developer tab to the Ribbon in Word. However, the steps are the same in Excel and PowerPoint.
In the Word Options dialog box, click "Customize the Ribbon" on the left side. On the far right list, under "Main Tabs," enable the "Developer" checkbox and then click "OK."
The Developer tab is now visible in the Ribbon.
The Developer tab is not context sensitive; it should stay visible no matter what you're doing in the app.