audience members can see a presentation on their devices and read live subtitles in their preferred language while you speak
Live PowerPoint presentations refer to the act of delivering a presentation using Microsoft PowerPoint in real-time to an audience. It typically involves the presenter sharing their screen while going through the slides, allowing viewers to follow along remotely or in-person. Live presentations can incorporate various multimedia elements such as text, images, videos, and animations to enhance the delivery and engagement. Presenters can interact with the slides, navigate through them, and explain the content while maintaining a visual and auditory connection with the audience. Live PowerPoint presentations are widely used in meetings, conferences, webinars, and educational settings to convey information effectively and facilitate audience interaction.
PowerPoint live is a presentation option in Microsoft Teams meetings and webinars (currently unavailable for Live Events) that lets you share PowerPoint slides without needing to directly share your screen.
With PowerPoint Live Presentations, audience members can view a presentation on their devices while reading live subtitles in their favorite language while you talk.

The live Presentation feature is announced by Microsoft that is available only for PowerPoint on the web. This feature is used to share and present the presentation globally, connecting via internet. It is a free service to use by all, but you just have to login in Microsoft account.