Annotate Keynote presentations live on Mac with a graphic pen tablet

Despite not liking Richard.Taylor's response, he's correct.

Keynote on Mac does not have any live drawing tool option, although Keynote on iOS does... and there's a hybrid option that might come close enough...

Using the Keynote Remote feature, you can use an iOS device (iPad or iPhone) to control the presentation playback, including using a stylus or finger to annotate live slides - in this way the iPhone/iPad almost replaces the tablet, with the advantage that you can directly see what you're annotating. Plus you're not tethered to the Mac, so you can walk around with the phone/iPad in hand and keep presenting, if that's your thing, which is something you can't easily do with a USB tablet.

If using an iPad or iPhone is not an option for you, then neither is Keynote (at least not in its current form, until and unless Apple add live annotation in the Mac version). That points you back to PowerPoint. The Mac version of PowerPoint, like its Windows counterpart, does support live annotation, although I don't know how well it responds to a pressure-sensitive tablet/stylus.

There are some third-party options that might work - they're generally application agnostic and work by creating an overlay on the screen which you draw into. I've never used them in a presentation, though, to know how well they work. Check the App Store for ScreenBrush or DeskScribble (and others).

This doesn't answer your Mac question, but I can tell you that in physics presentations I use my iPad and an Apple Pen (knockoff😏) I use it wired by HDMI, because that's more dependable in strange places, but with a very long cable I can walk around and underline, write equations, and sketch.

Of course there are rumors and hints of a touchscreen Mac coming, and that could change what's possible. It's also possible that the next OS or two will be more compatible with pens. No one here knows if or when that might happen, if ever. And I don't know if I want one. Just thinking…

Sumit_Yadav_Snbplc wrote: Currently, I don't have Apple iPad and Corresponding Apple Pencil. So Please suggest a genuine Method to record the Lectures and Run My online course Smoothly.

Please reply ASAP. It's a request from our side to you.

I think that I gave you my version of your number 2:

2. If Keynote doesn't support live drawing during a presentation, what apps or workarounds do other teachers recommend for lecturing with a stylus…

I responded exactly as you had asked. It would have saved me some time if you had said up front that you didn't really want that.