How to Use MS Word's Built-In Screenshot Tool

Without leaving the document you are working in, you can add a snapshot of the screen to your document. This is available in Excel, Outlook, PowerPoint, and Word.
Open the document in which you want to insert the screenshot:
1. Click the Insert tab.
2. Click Screenshot. A thumbnail image of every Window you have open is displayed.
3. Click one of the thumbnails to take a screenshot. It is automatically inserted into your Microsoft Word document.
You can also an area of an Active window:
4. Click Screen Clipping.
The screen goes dim, and you can draw a rectangular shape over the part you want to capture.
After you select the area to be screen clipped, Microsoft Word automatically inserts the image in you file.

[@Klariti]

NB - there's a mistake in the video where its says the Screenshot shows previous screenshots. Actually, what it's showing you are the applications currently open in the background. You can automatically take screenshots of these by toggling over each thumbnail.