A family of Microsoft word processing software products for creating web, email, and print documents.
Besides the Insert > Shapes command that Charles mentioned, in Word 2016 you should have a Draw tab on the ribbon:
This lets you draw on the document with a drawing pad, touchpad, or mouse.
If that tab isn't visible, first look in the File > Options > Customize Ribbon dialog. If the Draw tab is listed on the right side but doesn't have a check mark next to it, click to check it. If the Draw tab doesn't appear in the list, make sure you have updated Office to the most current build (go to File > Account > Update Options and click Update Now).