You can share your screen on Discord in a private call, or in public chat rooms with permission. Sharing your screen lets an audience interact with you while you play video games.

Discord is a voice and text app for gamers that makes it extremely easy to share your screen and stream games to your friends and other small audiences. While this method of streaming won't make your stream available to the general public like Twitch

This wikiHow will teach you how to share your screen in Discord using the desktop client. Unfortunately, there is no support to share your screen in the mobile app, so you'll have to use the desktop client for this feature.