We'll guide you through how to annotate PDFs on your Windows, Mac, iPhone, or Android devices for free, without the need for any additional third-party tools or software.

Take notes, make suggestions, and collaborate with others by annotating websites. This browser-by-browser guide gets you started.

Annotation allows you to sketch on a shared screen or Whiteboard. See the steps to enable annotation for Zoom meetings.

Learn how to share your screen, an application, or a whiteboard in a Zoom meeting and make annotations on screen.

When holding a video conference using Webex, you can also share content with the other participants in your conference. This means you can show them something on your computer screen, show them a file ...

Learn about a few PDF management and annotation tools for Mac OS X, and suggest your own favorites for this and other platforms.

You don't need to buy an expensive program to add comments or notes to a PDF. Here's how to use Apple's built-in application, Preview, to do it all.

We've already covered how you can do more with Preview in Leopard, but Mac OS X Hints points out another good one: image annotation.

Better data annotation—more accurate, detailed or contextually rich—can drastically improve an AI system’s performance, adaptability and fairness.

Take advantage of data annotations to decorate your models using attribute tags so that your application’s data definition can be managed in a single place.