Twitch panels are small blocks of text and images that streamers can use to provide additional information to their viewers. These panels are typically found below the stream, and they can be used to display things like the streamer's social media accounts, their schedule, and information about any sponsors or partnerships they may have.
Some streamers also use panels to provide links to their donation or subscription pages. Overall, Twitch panels are a useful tool for streamers to provide their viewers with additional information and to help build their community.