Mask" is the second single released by Dream, an American YouTuber and streamer who is most well known for creating Minecraft content. The song is about Dream's personal experiences with depression and ADHD, and the effect these disorders had on his own life. The song was released on May 20, 2021, and an animated music video for it was also released on June 8. Both the song and the music video have been widely criticized, with the song's lyrics being described as "basic" and "plain", and the video being scrutinized for its uncanny animation and controversial messages, spawning the "You Are Not Normal" and "Normal Pills" memes.