The acronym "ASMR" highlights one of the newest phenomena to be
encountered on YouTube in 2020 and 2021. "ASMR," which stands for
"autonomous sensory meridian response," refers to videos which feature
soft, often whispery-or-crackling sounds which are designed to induce a
response of calm joy and pleasure. The subjects of ASMR videos are as
broad as one's imagination, ranging from videos of people cracking clay
and slime plasters to videos of people cooking and eating street food
and mukbang in Korea. Some ASMR creators tap microphones with makeup
brushes and some tell stories. ASMR is useful for relaxation, with many
creators emphasizing its potential for helping a person to sleep. During
the long period of isolation occasioned by quarantine, ASMR videos have
provided some much-appreciated sensory stimulation for many viewers,
like yours truly. :)
Learn more on Wikipedia.