For projectors where that isn't the case you usually have three options: you can connect a device such as a laptop or Apple TV via the HDMI connector, run the streaming app on that and send its video to the projector; you can put a streaming stick such as an Amazon Fire TV Stick into the HDMI port and use that as your video source; or you can stream wirelessly from a device such as a laptop, Chromebook, phone or tablet. The two main standards for easy streaming are Google's Chromecast, which is in Android devices and the Chrome browser, and Apple's AirPlay 2, which is in iPhones, iPads and Macs.