Dust-free Popcorn Ceiling Removal

A popcorn ceiling, also known as a stipple ceiling or acoustic ceiling, is a ceiling with one of a variety of spray-on or paint-on treatments.
Source: https://en.wikipedia.org/wiki/Popcorn_ceiling

A conventional ceiling is a flat, seamless surface. The simplest type of ceiling is often finished with drywall and then painted.
Source: https://www.bobvila.com/slideshow/9-ceiling-types-you-ll-see-in-homes-52967

The look is achieved by spraying, troweling, or rolling drywall joint compound onto walls or ceilings to achieve stalactite-like peaks, then flattening the peaks with a knockdown knife. The resulting mottled, naturalistic texture adds dimensional visual impact while also handily hiding any surface imperfections.
Source: https://www.bobvila.com/articles/knockdown-texture/